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Prepared By:
Scott Cutler
InfoGard Laboratories
709 Fiero Ln., Suite 25
San Luis Obispo, CA, 93401
Arista Networks 7050X,
7250X, 7300X and 7500E
Series Security Target
Document Version
13‐3140‐R‐0034
Version: 1.6
July 22, 2014
Prepared For:
Arista Networks
5453 Great America Parkway
Santa Clara, CA, 95054
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Notices:
©2014 Arista Networks All rights reserved. All other brand names are trademarks, registered
trademarks, or service marks of their respective companies or organizations.
May be reproduced only in its original entirety (without revision).
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Table of Contents
TABLE OF CONTENTS............................................................................................................................ 3
TABLES................................................................................................................................................. 6
1 SECURITY TARGET (ST) INTRODUCTION .......................................................................................... 7
1.1 SECURITY TARGET REFERENCE ............................................................................................................ 7
1.2 TARGET OF EVALUATION REFERENCE.................................................................................................... 7
1.3 TARGET OF EVALUATION OVERVIEW .................................................................................................... 8
1.3.1 TOE PRODUCT TYPE .............................................................................................................................. 8
1.3.2 TOE USAGE..........................................................................................................................................8
1.3.3 TOE MAJOR SECURITY FEATURES ............................................................................................................ 9
1.3.4 TOE IT ENVIRONMENT HARDWARE/SOFTWARE/FIRMWARE REQUIREMENTS .................................................10
1.3.4.1 Network Requirements................................................................................................................ 10
1.3.4.2 Software Requirements............................................................................................................... 10
1.3.4.3 Hardware Requirements.............................................................................................................. 10
1.4 TARGET OF EVALUATION DESCRIPTION ............................................................................................... 11
1.4.1 TARGET OF EVALUATION PHYSICAL BOUNDARIES ......................................................................................12
1.4.2 TARGET OF EVALUATION LOGICAL BOUNDARIES .......................................................................................13
1.4.2.1 Audit.............................................................................................................................................13
1.4.2.2 Cryptographic Operations............................................................................................................ 13
1.4.2.3 User Data Protection ................................................................................................................... 14
1.4.2.4 Identification and Authentication................................................................................................ 14
1.4.2.5 Security Management.................................................................................................................. 14
1.4.2.6 Protection of the TSF ................................................................................................................... 15
1.4.2.7 TOE Access ...................................................................................................................................15
1.4.2.8 Trusted Path/Channels ................................................................................................................ 15
1.5 NOTATION, FORMATTING, AND CONVENTIONS..................................................................................... 16
2 CONFORMANCE CLAIMS............................................................................................................... 17
2.1 COMMON CRITERIA CONFORMANCE CLAIMS ....................................................................................... 17
2.2 CONFORMANCE TO PROTECTION PROFILES.......................................................................................... 17
2.3 CONFORMANCE TO SECURITY PACKAGES............................................................................................. 17
2.4 CONFORMANCE CLAIMS RATIONALE .................................................................................................. 17
3 SECURITY PROBLEM DEFINITION .................................................................................................. 18
3.1 THREATS...................................................................................................................................... 18
3.2 ORGANIZATIONAL SECURITY POLICIES ................................................................................................ 18
3.3 ASSUMPTIONS .............................................................................................................................. 18
4 SECURITY OBJECTIVES .................................................................................................................. 20
4.1 SECURITY OBJECTIVES FOR THE TOE .................................................................................................. 20
4.2 SECURITY OBJECTIVES FOR THE OPERATIONAL ENVIRONMENT ................................................................. 20
5 EXTENDED COMPONENTS DEFINITION ......................................................................................... 21
5.1 EXTENDED SECURITY FUNCTIONAL REQUIREMENTS DEFINITIONS.............................................................. 21
5.2 EXTENDED SECURITY ASSURANCE REQUIREMENT DEFINITIONS ................................................................ 21
6 SECURITY REQUIREMENTS............................................................................................................ 22
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6.1 SECURITY FUNCTION REQUIREMENTS................................................................................................. 22
6.1.1 SECURITY AUDIT (FAU)........................................................................................................................ 22
6.1.1.1 FAU_GEN.1 Audit Data Generation ............................................................................................. 22
6.1.1.2 FAU_GEN.2 User Identity Association .........................................................................................25
6.1.1.3 FAU_STG_EXT.1 External Audit Trail Storage ..............................................................................25
6.1.2 CRYPTOGRAPHIC SUPPORT (FCS)........................................................................................................... 26
6.1.2.1 FCS_CKM.1 Cryptographic Key Generation (for asymmetric keys) .............................................26
6.1.2.2 FCS_CKM_EXT.4 Cryptographic Key Zeroization .........................................................................27
6.1.2.3 FCS_COP.1(1) Cryptographic Operation (for data encryption/decryption).................................28
6.1.2.4 FCS_COP.1(2) Cryptographic Operations (for cryptographic signature) .....................................29
6.1.2.5 FCS_COP.1(3) Cryptographic Operation (for cryptographic hashing) .........................................29
6.1.2.6 FCS_COP.1(4) Cryptographic Operation (for keyed hash message authentication) ...................30
6.1.2.7 FCS_SSH_EXT.1 SSH ..................................................................................................................... 30
6.1.2.8 FCS_RBG_EXT.1 Cryptographic Operation (Random Bit Generation) .........................................32
6.1.3 USER DATA PROTECTION (FDP)............................................................................................................. 35
6.1.3.1 FDP_RIP.2 Full Residual Information Protection .........................................................................35
6.1.4 IDENTIFICATION AND AUTHENTICATION (FIA) .......................................................................................... 35
6.1.4.1 FIA_PMG_EXT.1 Password Management ....................................................................................35
6.1.4.2 FIA_UIA_EXT.1 User Identification and Authentication ..............................................................36
6.1.4.3 FIA_UAU_EXT.2 Password‐based Authentication Mechanism....................................................37
6.1.4.4 FIA_UAU.7 Protected Authentication Feedback..........................................................................38
6.1.5 SECURITY MANAGEMENT (FMT) ........................................................................................................... 38
6.1.5.1 FMT_MTD.1 Management of TSF Data (for general TSF data)....................................................38
6.1.5.2 FMT_SMF.1 Specification of Management Functions.................................................................39
6.1.5.3 FMT_SMR.2 Restrictions on Security Roles .................................................................................39
6.1.6 PROTECTION OF THE TSF (FPT) ............................................................................................................. 40
6.1.6.1 FPT_SKP_EXT.1 Protection of TSF Data (for reading of all symmetric keys) ...............................40
6.1.6.2 FPT_APW_EXT.1 Protection of Administrator Passwords ...........................................................40
6.1.6.3 FPT_STM.1 Reliable Time Stamps................................................................................................ 41
6.1.6.4 FPT_TUD_EXT.1 Trusted Update ................................................................................................. 41
6.1.6.5 FPT_TST_EXT.1 TSF Testing.......................................................................................................... 42
6.1.7 TOE ACCESS (FTA) ............................................................................................................................. 42
6.1.7.1 FTA_SSL_EXT.1 TSF‐initiated Session Locking..............................................................................42
6.1.7.2 FTA_SSL.3 TSF‐initiated Termination........................................................................................... 43
6.1.7.3 FTA_SSL.4 User‐initiated Termination.........................................................................................43
6.1.7.4 FTA_TAB.1 Default TOE Access Banners......................................................................................43
6.1.8 TRUSTED PATH/CHANNELS (FTP) .......................................................................................................... 44
6.1.8.1 FTP_ITC.1 Inter‐TSF‐trusted channel ........................................................................................... 44
6.1.8.2 FTP_TRP.1 Trusted Path............................................................................................................... 45
6.2 SECURITY ASSURANCE REQUIREMENTS............................................................................................... 46
6.2.1 EXTENDED SECURITY ASSURANCE REQUIREMENTS ....................................................................................47
6.2.1.1 ADV_FSP.1....................................................................................................................................47
6.2.1.2 AGD_OPE.1 ..................................................................................................................................47
6.2.1.3 AGD_PRE.1...................................................................................................................................48
6.2.1.4 ATE_IND.1 ....................................................................................................................................48
6.2.1.5 AVA_VAN.1 ..................................................................................................................................48
6.3 SECURITY REQUIREMENTS RATIONALE................................................................................................ 49
6.3.1 SECURITY FUNCTION REQUIREMENT TO SECURITY OBJECTIVE RATIONALE .....................................................49
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6.3.1.1 Protected Communications ......................................................................................................... 50
6.3.1.2 Verifiable Updates ....................................................................................................................... 50
6.3.1.3 System Monitoring.......................................................................................................................51
6.3.1.4 TOE Administration...................................................................................................................... 51
6.3.1.5 Residual Information Clearing ..................................................................................................... 52
6.3.1.6 TSF Self Test .................................................................................................................................52
6.3.2 SECURITY FUNCTIONAL REQUIREMENT DEPENDENCY RATIONALE ................................................................52
6.3.3 SECURITY ASSURANCE REQUIREMENTS RATIONALE ...................................................................................52
7 TOE SUMMARY SPECIFICATION.................................................................................................... 53
7.1 SECURITY AUDIT............................................................................................................................ 53
7.1.1 AUDIT GENERATION............................................................................................................................. 53
7.1.2 AUDIT STORAGE..................................................................................................................................53
7.2 CRYPTOGRAPHIC OPERATIONS.......................................................................................................... 54
7.2.1 SSH ..................................................................................................................................................54
7.2.2 RFC COMPLIANCE ............................................................................................................................... 54
7.2.3 NIST 800‐56A/B COMPLIANCE............................................................................................................ 55
7.2.4 SECRET KEYS, PRIVATE KEYS, AND CSPS.................................................................................................. 55
7.2.4.1 Private SSH Key ............................................................................................................................ 55
7.2.4.2 Passwords ....................................................................................................................................55
7.2.4.3 SSH and 800‐90A CSPs ................................................................................................................. 55
7.3 USER DATA PROTECTION................................................................................................................. 56
7.4 IDENTIFICATION AND AUTHENTICATION .............................................................................................. 57
7.5 SECURITY MANAGEMENT ................................................................................................................ 57
7.6 PROTECTION OF THE TSF................................................................................................................. 57
7.6.1 PRE‐SHARED, SYMMETRIC, AND PRIVATE KEY STORAGE METHODS ..............................................................57
7.6.2 PROTECTION OF ADMINISTRATOR PASSWORDS.........................................................................................58
7.6.3 TIME .................................................................................................................................................58
7.6.4 UPDATES............................................................................................................................................58
7.6.5 SELF‐TESTS.........................................................................................................................................58
7.7 TOE ACCESS................................................................................................................................. 59
7.8 TRUSTED PATH/CHANNELS.............................................................................................................. 59
7.8.1 IT ENTITY ‐ AUDIT SERVER .................................................................................................................... 59
7.8.2 REMOTE TOE ADMINISTRATION METHODS ............................................................................................. 59
8 TERMS AND DEFINITIONS............................................................................................................. 60
9 REFERENCES................................................................................................................................. 61
10 ANNEX A: OPENSSH DOCUMENTED DEVIATIONS AND EXTENSIONS.............................................. 62
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Tables
Table 1: SFP Interfaces................................................................................................................................10
Table 2: Supported Power Supply / Fan Module Bundles ..........................................................................11
Table 3: TOE Module Capacity.................................................................................................................... 12
Table 4: Supported Line Card Modules and Network Interfaces................................................................12
Table 5: Threats ..........................................................................................................................................18
Table 6: Organizational Security Policies .................................................................................................... 18
Table 7: Assumptions..................................................................................................................................18
Table 8: Security Objectives for the TOE .................................................................................................... 20
Table 9: Security Objectives for the Operational Environment..................................................................20
Table 10: Auditable Events ......................................................................................................................... 22
Table 11: Assurance Requirements ............................................................................................................ 46
Table 12: SFR to Objective Mapping........................................................................................................... 49
Table 13: Auditable Protocol Failures......................................................................................................... 53
Table 14: NIST 800‐56A/B Compliance ....................................................................................................... 55
Table 15: OpenSSL Cryptographic CSPs and IVs.......................................................................................... 56
Table 16: Key Storage .................................................................................................................................58
Table 17: TOE Access Methods................................................................................................................... 59
Table 18: Audit Protocols and Communication Mechanisms.....................................................................59
Table 19: Remote TOE Administration Methods........................................................................................59
Table 20: TOE Abbreviations and Acronyms............................................................................................... 60
Table 21: CC Abbreviations and Acronyms................................................................................................. 60
Table 22: TOE Guidance Documentation.................................................................................................... 61
Table 23: Common Criteria v3.1 References .............................................................................................. 61
Table 24: Supporting Documentation......................................................................................................... 61
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1 Security Target (ST) Introduction
 The ST introduction shall contain an ST reference, a TOE reference, a TOE overview and a TOE
description.
 The ST reference shall uniquely identify the ST.
 The TOE reference shall identify the TOE.
The structure of this document is defined by CC v3.1r3 Part 1 Annex A.2, “Mandatory contents of an ST”:
 Section 1 contains the ST Introduction, including the ST reference, Target of Evaluation (TOE)
reference, TOE overview, and TOE description.
 Section 2 contains conformance claims to the Common Criteria (CC) version, Protection Profile
(PP) and package claims, as well as rationale for these conformance claims.
 Section 3 contains the security problem definition, which includes threats, Organizational
Security Policies (OSP), and assumptions that must be countered, enforced, and upheld by the
TOE and its operational environment.
 Section 4 contains statements of security objectives for the TOE, and the TOE operational
environment as well as rationale for these security objectives.
 Section 5 contains definitions of any extended security requirements claimed in the ST.
 Section 6 contains the security function requirements (SFR), the security assurance
requirements (SAR), as well as the rationale for the claimed SFR and SAR.
 Section 7 contains the TOE summary specification, which includes the detailed specification of
the IT security functions
1.1 Security Target Reference
The Security Target reference shall uniquely identify the Security Target.
ST Title: Arista Networks 7050X, 7250X, 7300X and 7500E Series Security Target
ST Version Number: Version 1.6
ST Author(s): Scott Cutler
ST Publication Date: July 22, 2014
Keywords: Network Device, Switch, LAN, Router
1.2 Target of Evaluation Reference
The Target of Evaluation reference shall identify the Target of Evaluation.
TOE Developer Arista Networks
5453 Great America Parkway
Santa Clara, CA, 95054
TOE Name Arista 7050X Series; DCS‐7050SX‐128‐F, DCS‐7050SX‐128‐R; EOS V4.13.3.4
Arista 7250X Series; DCS‐7250QX‐64‐F, DCS‐7250QX‐64‐R; EOS V4.13.3.4
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Arista 7300X Series; DCS‐7316X‐BND‐F, DCS‐7316X‐BND‐D‐F, DCS‐7316X‐BND‐R,
DCS‐7316X‐BND‐D‐R, DCS‐7308X‐BND‐F, DCS‐7308X‐BND‐D‐F, DCS‐7308X‐BND‐
R, DCS‐7308X‐BND‐D‐R, DCS‐7304X‐BND‐F, DCS‐7304X‐BND‐D‐F, DCS‐7304X‐
BND‐R, DCS‐7304X‐BND‐D‐R, DCS‐7300X‐64S‐LC, DCS‐7300X‐64T‐LC, DCS‐7300X‐
32Q‐LC; EOS V4.13.3.4
Arista 7500E Series; DCS‐7508E‐BND, DCS‐7504E‐BND, DCS‐7508E‐BND‐D, DCS‐
7504E‐BND‐D, DCS‐7500E‐36Q‐LC, DCS‐7500E‐72S‐LC, DCS‐7500E‐48S‐LC, DCS‐
7500E‐12CM‐LC; EOS V4.13.3.4
TOE Version DCS‐7050SX‐128‐F, DCS‐7050SX‐128‐R; CPU Model: Intel(R) Pentium(R) CPU @
1.50GHz, Security Chip: R5H30211, Forwarding ASIC: Linecard0/0: Chip:
BCM56850
Arista 7250X Series; CPU Model: Intel(R) Pentium(R) CPU @ 1.50GHz, Security
Chip: R5H30211, Forwarding ASIC: Linecard x/y1
: Chip: BCM56850
Arista 7300X Series; CPU Model: Intel(R) Xeon(R) CPU @ 2.60GHz, Security Chip:
R5H30211, Forwarding ASIC: Linecard x/y1
: Chip: BCM56850
Arista 7500E Series; CPU Model: Intel(R) Xeon(R) CPU @ 2.60GHz, Security Chip:
R5H30211, Forwarding ASIC: Aradx/y1
Model: Arad,
1.3 Target of Evaluation Overview
1.3.1 TOE Product Type
The TOE is classified as a Network Device (a generic infrastructure device that can be connected to a
network).
1.3.2 TOE Usage
The TOE, the Arista 7050X, 7250X, 7300X and 7500E Series, are Network Devices that provides layer 2, 3,
and 4 Ethernet network management and interconnectivity. The Ethernet management layers refer to
the Open Systems Interconnection (OSI) model layers. They refer to the data link, network, and
transport layers respectively. It also contains a modern Linux‐based operating system that allows for
complex management solutions. It is designed with high performance electronics to meet the needs of
latency‐critical applications such as financial Electronic Communication Networks (ECNs) or High
Performance Computing (HPC) clusters
Both the Arista 7500E and 7300X Series Network Devices are modular switch sets that consist of a
chassis and one or more line cards. A chassis contains the power supplies, supervisor module, and fabric
modules that enable interconnectivity between line cards. Line cards are modular sets of network
interfaces that are inserted into the chassis. Line cards that are compatible with the 7300X Series start
with the model name “DCS‐7300X,” whereas line cards for the 7500E Series start with the model name
“DCS‐7500E.” Each line card and chassis model differs by the type and number of network interfaces
supported, and the chassis range in size between 7 and 21 RU.
1
Note: The output of “Forwarding ASIC” will vary in the number of linecards, and depend on how many
and which linecards are populating the chassis. X and Y will be integers denoting each linecard in the
configuration. All ASIC types for a specific TOE will always display the same chip or model type.
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The Arista 7050X and 7250X Series Network Devices use the same packet forwarding architecture and
software as the 7300X, but are fixed form factor, and standalone switches that do not support
interchangeable fabric modules, line cards, or supervisor modules. The Arista Series 7050X and 7250X
chassis range in size between 1 and 2 RU.
The TOE can direct and filter network packets based on the contents within each of these layers. It is
also capable of supporting many modern layer‐specific traffic management features including the
following unevaluated features:
• 802.1w, 802.1s Spanning Tree Protocol (STP)
• 802.3ad and Multi‐Chassis Link Aggregation
• 802.3x Flow Control
• Virtual Local Area Networks (VLANs)
• Access Control Lists (ACLs)
• Virtualization support (VXLAN and VMware)
• Quality of Service (QoS) rate limiting and queuing
• Congestion monitoring and management
The TOE supports remote administration over the Secure Shell v2 (SSHv2) protocol that supports
cryptographic encryption and authentication using FIPS‐certified algorithms. Remote administration is
configured using an internal role‐based access control system that allows for flexible administrator
permissions and capabilities.
The TOE also supports storage and forwarding of detailed audit logs. The process that manages audit
messages is capable of forwarding audit messages, encrypted using SSHv2, to any syslog‐compatible
network entity.
1.3.3 TOE Major Security Features
 Audit
o Generates audit events and stores them locally and/or remotely.
o Supports secure communication to remote syslog‐compatible audit servers.
 Cryptography
o Several NIST‐recommended cryptographic algorithms and data zeroization help support
secure communications and device functionality.
 User Data Protection
o User information is stored and forwarded in a secure manner to ensure data is not
leaked.
 Identification and Authentication
o Password and user access polices are enforced by the TOE.
 Security Management
o Administrators may locally or remotely log into the TOE to administer the TSF
functionality.
 Protection of the TSF
o Critical security parameters are protected from disclosure.
o Self‐tests are run each power‐up to help ensure the correct functionality of the TSF.
 TOE Access
o Administrative sessions are protected using timeout and log‐out mechanisms.
 Trusted Path/Channels
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o The TOE provides cryptographically secure communication channels and paths between
administrators and authorized IT entities.
1.3.4 TOE IT environment hardware/software/firmware requirements
1.3.4.1 Network Requirements
For remote storage of audit logs, a remote syslog server capable of SSHv2 tunneled connections is
required. It must be reachable over the Ethernet administrative network interface. The SSHv2
implementation on the audit server must be capable of the following cryptographic algorithms: RSA‐
2048 for public‐key authentication, AES‐128/256 CBC for data encryption, HMAC‐SHA1 for data
integrity, and diffie‐hellman‐group14‐sha1 for key exchange.
For time synchronization a remote server capable of NTPv4 (RFC 5095) is required. The server must be
reachable over the Ethernet administrative network interface.
1.3.4.2 Software Requirements
For management over the console port a RS232 terminal application for a Personal Computer (PC) is
required.
For management over SSH a client capable of connecting over SSHv2 is required. The client must be
capable of the algorithms detailed in the Network Requirements section above.
1.3.4.3 Hardware Requirements
Non‐administrative network interfaces are provided on line card modules and designed to be flexible to
meet the needs of the network administrator. For most non‐administrative network interfaces, a
separate Small Form Factor Pluggable (SFP+), or Quad Small Form‐factor Pluggable (QSFP+) module is
required to provide physical Ethernet connectivity. Two types of non‐administrative interfaces do not
require SFPs: 100 Gigabit Ethernet SR10 Embedded Multi‐Speed‐Ports (MXP), and 10GBASE‐T copper RJ‐
45 interfaces. Further explanations of SFPs and QSFPs are provided in section 1.4. The TOE supports the
following SFP and QSFP interfaces:
Table 1: SFP Interfaces
SFP Interface SFP Type Speed (gigabit) 7500E 7300X 7050SX‐
128
7250QX‐
64
40GBASE‐CR4 QSFP+ 40    
40GBASE‐SR4 QSFP+ 40    
AOC‐40G‐Q‐Q QSFP+ 40    
40GBASE‐XSR4 QSFP+ 40    
40G‐PLRL4 QSFP+ 40    
40G‐LRL4 QSFP+ 40    
40GBASE‐LR4 QSFP+ 40    
10GBASE‐CR QSFP+ / SFP+ 10    
10GBASE‐SRL SFP+ 10   
10GBASE‐SR SFP+ 10   
10GBASE‐LR SFP+ 10   
10GBASE‐LRL SFP+ 10   
10GBASE‐ER SFP+ 10   
10GBASE‐ZR SFP+ 10   
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Table 1: SFP Interfaces
SFP Interface SFP Type Speed (gigabit) 7500E 7300X 7050SX‐
128
7250QX‐
64
10GBASE‐DWDM SFP+ 10   
1GbE‐SX SFP+ 1   
1GbE‐LX SFP+ 1   
1GbE‐TX SFP+ 1   
100Mb‐TX SFP+ 0.1 
The DCS‐7500E‐12CM‐LC line card includes 12, 100GbE SR10 Embedded Multi‐Speed‐Ports (MXP) ports.
These optics are included within the module and therefore no additional SFP modules are required.
For management over the console port a PC with a serial communications port is required.
The Arista 7500E and 7300X Series chassis includes a single management module, but supports an
additional management module for redundancy. The management module includes a 2.6 GHz x86‐64
CPU, 16GB of RAM, 4GB of flash storage, and provides the RS232 and Ethernet management interfaces
as well as a USB storage interface. The Arista 7500E Series supports the DCS‐7500E‐SUP management
module, while the Arista 7300X Series supports the DCS‐7300‐SUP management module.
The Arista 7050X and 7250X Series do not support redundant management modules.
Each chassis model of the TOE includes the necessary power supplies and fans. However, each power
supply is modular and can be replaced. The Arista 7300X Series chassis also includes two empty power
supply slots for additional redundancy. Power supplies can be purchased as a bundle along with the fan
modules. The TOE supports the following models of power supply / fan module bundles:
Table 2: Supported Power Supply / Fan Module Bundles
Product Number Description Airflow Direction
PWR‐2900‐AC 2900 Watt AC PSU for Arista 7500E Series front‐to‐rear
PWR‐3K‐AC‐F 3000 Watt AC PSU for Arista 7300X Series front‐to‐rear
PWR‐3K‐AC‐R 3000 Watt AC PSU for Arista 7300X Series rear‐to‐front
PWR‐750AC‐F 750 Watt AC PSU for Arista 7050SX‐128 model front‐to‐rear
PWR‐750AC‐R 750 Watt AC PSU for Arista 7050SX‐128 model rear‐to‐front
PWR‐1100AC‐F 1100 Watt AC PSU for Arista 7250QX‐64 model front‐to‐rear
PWR‐1100AC‐R 1100 Watt AC PSU for Arista 7250QX‐64 model rear‐to‐front
1.4 Target of Evaluation Description
The TOE is a network switch that is intended to connect many Ethernet‐based network devices together
in an enterprise environment while maintaining security. The TOE is first comprised of a chassis, several
baseline modules, and one or more line cards. Compatible modules include line cards, power supplies,
supervisors (system motherboards), and fabric connectors. Line cards provide the non‐administrative
network interfaces, which interconnect via the fabric modules. The TOE chassis comes with the
necessary baseline modules (power supplies, fabric connectors, and one supervisor module) to support
the maximum amount of line cards, while line cards are purchased individually based on the
administrator’s needs. More power supplies and supervisor modules can be purchased for redundancy.
Each non‐administrative network interface uses either a small form‐factor pluggable (SFP) transceiver or
embedded multi‐speed‐port (MXP) to provide connectivity between the network device switching fabric
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and a fiber optic or copper cable. This allows the customer to use several different types of network
cables with the network device. The list of compatible SFPs is provided in Table 1 and the user guidance.
Each chassis, within a series, varies by the amount of line cards supported, with larger models requiring
more power supplies and fabric connectors as well. The number of modules supported by each chassis is
listed in the table below.
Table 3: TOE Module Capacity
TOE Chassis
Model
Included, Maximum
Power Supplies
Included, Maximum
Supervisors
Included Fabric
Connectors
Maximum Line Cards
DCS‐7316 6, 8 1, 2 4 16
DCS‐7308 4, 6 1, 2 4 8
DCS‐7304 2, 4 1, 2 4 4
DCS‐7508 4, 4 1, 2 6 8
DCS‐7504 4, 4 1, 2 6 4
Each line card varies by the number and type of SFPs or network interfaces supported. These line card
interfaces are detailed in the table below. The Arista 7300X and 7500E Series differ by the method of
connecting line cards (fabric architecture), and consequently have separate line cards and packet
processing ASICs for each series.
Because the Arista 7050X and 7250X do not support modular line cards, the models within those series
vary by the number and type of (static) network interfaces offered. This information is also included in
the table below.
The TOE security chip refers to the Renesas chip of the same model number that serves as an entropy
source.
The Arista Extensible Operating System, or Arista EOS, is built upon the mainline Linux kernel
(www.kernel.org) and an x86 dual or quad core CPU.
Table 4: Supported Line Card Modules and Network Interfaces
TOE Series Line Card Model Network Interfaces
7300X DCS‐7300X‐32Q‐LC 32 x QSFP+
7300X DCS‐7300X‐64S‐LC 48 x SFP+
4 x QSFP+
7300X DCS‐7300X‐64T‐LC 48 x 10GBASE‐T
4 x QSFP+
7500E DCS‐7500E‐36Q‐LC 36 x QSFP+
7500E DCS‐7500E‐12CM‐LC 12 x MXP
7500E DCS‐7500E‐72S‐LC 48 x SFP+
2 x MXP
7500E DCS‐7500E‐48S‐LC 48 x SFP+
7050SX‐128 (n/a) 96 x SFP+
8 x QSFP+
7250QX‐64 (n/a) 64 x QSFP+
1.4.1 Target of Evaluation Physical Boundaries
The TOE consists of the following hardware:
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Arista 7300X Series DCS‐7316, DCS‐7308, DCS‐7304 Chassis
Arista 7300X Series DCS‐7300X‐32Q‐LC, DCS‐7300X‐64S‐LC, DCS‐7300X‐64T‐LC Line Cards
Arista 7500E Series DCS‐7508, DCS‐7504 Chassis
Arista 7500E Series DCS‐7500E‐36Q‐LC, DCS‐7500E‐12CM‐LC, DCS‐7500E‐72S‐LC, DCS‐7500E‐
48S‐LC Line Cards
Arista 7050X Series DCS‐7050SX‐128 (‐F and ‐R) Switch
Arista 7250X Series DCS‐7250QX‐64(‐F and ‐R) Switch
Which runs the following software:
Arista Extensible Operating System (EOS) 4.13.3.4
And includes the following documentation that are available online:
Common Criteria Guidance Supplement, 1.4, June 10, 2014
Arista User Manual, June 9, 2014
Arista EOS System Message Guide, April 18, 2014
Arista 7000 Series 2 RU Data Center Switches Quick Start Guide, DCS‐7250QX‐64, DCS‐7050SX‐
128
Arista 7300 Series Modular Data Center Switches Quick Start Guide, DCS‐7304, DCS‐7.308, DCS‐
7316
Arista 7500 Series Modular Data Center Switches Quick Start Guide, DCS‐7508‐7508E, DCS‐
7504/7504E
1.4.2 Target of Evaluation Logical Boundaries
The logical boundaries of the TOE include those security functions implemented exclusively by the TOE.
These security functions are summarized in Section 1.3.3 above and are further described in the
following subsections. A more detailed description of the implementation of these security functions is
provided in Section 7, “TOE Summary Specification.”
1.4.2.1 Audit
The Arista EOS uses an internal syslog process that receives, stores, and forwards auditable events from
all system processes. When a user or system process triggers applicable TSF functionality an audit
message is generated, and sent to the internal syslog process. These events are then sent to an external
audit server for storage and review by an administrator. The communication between the TOE and
external audit server is protected by tunneling the syslog protocol through an encrypted SSH tunnel.
1.4.2.2 Cryptographic Operations
The TSF performs the following cryptographic operations:
 SSH with the following algorithms:
o RSA‐2048 for public‐key authentication (FIPS algorithm cert# 1315)
o AES‐128/256 CBC for data encryption (FIPS algorithm cert# 2567)
o HMAC‐SHA1 for data integrity (FIPS algorithm cert# 1584)
o diffie‐hellman‐group14‐sha1 for key exchange
 SHA‐512 for the following purposes: (FIPS algorithm cert# 2163)
o Local administrator password storage and authentication
o CLI “verify” function which allows the SHA‐512 hash calculation of any file
 SHA‐1 for the following purposes: (FIPS algorithm cert# 2163)
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o Used within HMAC‐SHA1 and diffie‐hellman‐group14‐sha1
 HMAC‐SHA1 for the following purposes: (FIPS algorithm cert# 1584)
o SSH data integrity
 Random bit generation using FIPS 140‐2 X9.31‐AES (FIPS algorithm cert# 1218)
The TSF uses the OpenSSL library to manage session‐based plaintext secret and private cryptographic
keys and Critical Security Parameters, (CSPs). During an SSH session, CSPs are stored within a central
data structure and all functions are given pointers to the single instance of that data structure. After the
CSPs are no longer needed and the session has terminated, a function call overwrites the entire data
structure that contains all private keys and CSPs with zeros.
The TOE requires the user to perform a separate procedure in order to zeroize and replace the private
RSA keys that are no longer used for SSH authentication.
1.4.2.3 User Data Protection
The TOE uses various software and hardware mechanisms to ensure that network packets traveling
through the TOE are not re‐used or accessible once they have finished being used by the TOE. The
hardware packet‐routing architecture is built without the use of padding to ensure that all data is passed
between components exactly as‐is. Therefore, when an Ethernet packet is received by the switch, the
exact size of the packet is known and allocated for in global memory. When a packet is stored within
global memory it is stored along with metadata to ensure packet integrity.
The Linux kernel API, which handles padding in a safe manner, is leveraged to generate packets
internally. If the kernel is given a payload that does not meet the minimum payload size requirement it
will pad the payload with zeros. In addition, the kernel will not accept payloads with a bit length non‐
divisible by eight. Therefore, each individual system process is responsible for creating a payload that
does not require padding past the minimum length requirement. These features together protect user
data from being disclosed.
1.4.2.4 Identification and Authentication
The TOE supports password authentication for administrative users over console and SSH. The TOE also
supports RSA key‐based authentication for administrative users over SSH. The TOE stores administrator
passwords locally using SHA‐512 hashing and allows special characters and passwords in excess of 15
characters. The TOE contains an AAA (authentication, authorization and accounting) module that stores
and manages permissions for users. The AAA module stores the privilege level of each user along with all
other information required to access the TOE. The TOE enforces that administrative users authenticate
through this mechanism before performing any administrative actions.
This document uses the terms administrator as a term for a user with the ability to log into the TOE
locally or remotely and administer it. The root account is an administrator account, disabled by default,
that fits the above description but falls outside the CC‐evaluation because of its ability to access another
CLI interface, Bash. The bash interface is undocumented and treated as a maintenance tool that is
outside the scope of the evaluation. The use of the bash interface, along with the root account, creates
security impacts that are discussed in Section 7.6.1.
1.4.2.5 Security Management
The TOE allows a remote administrator to manage the TOE using a local RS‐232 console, or remotely
using an SSHv2 session. The TOE provides a custom CLI interface to administer the TOE, which provides
authentication and restricts the ability to manage the TOE to security administrators. The TOE also
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provides administrators with the ability to update the TOE and verify their integrity using SHA‐512
hashing algorithm.
1.4.2.6 Protection of the TSF
The TOE protects TSF data from disclosure using different cryptographic methods and security‐
functionality. The TOE provides administrative access to users through a CLI that enforces user and
group profiles established by the local role‐based access control provided by EOS. The administrator
configures user profiles that specify varying degrees of access to the system. The limited CLI, user
account system, and underlying file system permissions serve to restrict access to TSF data such as
private keys. Plaintext private keys used for SSH authentication are stored on internal flash which is only
accessible through CLI commands performed by the local root account. Local administrator passwords
are stored by the TOE and kept in a hashed form so that they cannot be read in plaintext format.
The TOE derives a reliable time source for logging and other system processes through the local NTP
service. The exact time can be provided by setting the value locally, or through synchronizing the time
from an external server via NTP.
When updating TSF functionality, a published cryptographic hash of the updated software is provided to
the user to ensure the integrity of the software.
The TOE is also able to verify that TSF protection is functioning properly by running a memory test at
boot‐time and several diagnostic tools throughout the operation of the TOE. During the EOS boot
sequence the TOE also initializes the OpenSSL FIPS self‐tests against each cryptographic algorithm
supported by SSH.
1.4.2.7 TOE Access
In order to mitigate unauthorized access to the TOE, administrative sessions can be terminated manually
or automatically. If an administrator accesses the TOE, the session may be terminated by the
administrator’s own actions or automatically after a specified time of inactivity. These termination
features apply to both local and remote connections to the TOE.
The TOE will also display a customizable warning message that is displayed to the user during each
administrative logon. The message is designed to serve as an advisory notice and consent warning
regarding use of the TOE.
1.4.2.8 Trusted Path/Channels
The TOE implements and requires a secured method of communication between itself, audit servers
and remote administrators. In order to accomplish a secure connection to external devices, the TOE uses
an SSHv2 connection with RSA based authentication and AES‐based encryption. A private/public key pair
can either be generated by the TOE or imported from another device and imported into the TOE. After
an SSHv2 connection is authenticated via RSA key pairs, AES encryption keys are exchanged via diffie‐
hellman‐group14‐sha1 key exchange algorithm. After these steps, all further traffic between the TOE
and the external device is encrypted via AES‐128\256‐CBC encryption. Although the product uses AES‐
128/256, the security strength of the connections it forms are only 112 bits, (diffie‐hellman‐group14‐
sha1). This method provides assured identification of the external device and prevents disclosure or
undetected modification of data across the communication channel. Communications between the TOE
and IT entities may be initiated from either the TOE or the IT entity.
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Remote administrators may also create a secured connection to the TOE that provides cryptographic
authentication and protection of data. Remote administrators connecting to the TOE via SSHv2 have the
option of using password‐based authentication or RSA key‐based authentication
1.5 Notation, formatting, and conventions
The notation, formatting, and conventions used in this Security Target are defined below; these styles
and clarifying information conventions were developed to aid the reader.
Where necessary, the ST author has added application notes to provide the reader with additional
details to aid understanding; they are italicized and usually appear following the element needing
clarification. Those notes specific to the TOE are marked “TOE Application Note;” those taken from the
ND Protection Profile are marked “PP Application Note.”
The notation conventions that refer to iterations, assignments, selections, and refinements made in this
Security Target are in reference to SARs and SFRs taken directly from CC Part 2 and Part 3 as well as any
SFRs and SARs taken from a protection profile.
The notation used in the PP to indicate iterations, assignments, selections, and refinements of SARs and
SFRs taken from CC Part 2 and Part 3 is not carried forward into this document. Additionally, obvious
errors in the PP are corrected and noted as such.
The CC permits four component operations (assignment, iteration, refinement, and selection) to be
performed on requirement components. These operations are defined in Common Criteria, Part 1;
paragraph 6.4.1.3.2, “Permitted operations on components” as:
 Iteration: allows a component to be used more than once with varying operations;
 Assignment: allows the specification of parameters;
 Selection: allows the specification of one or more items from a list; and
 Refinement: allows the addition of details.
Iterations made by the ST and PP author are indicated by a number in parenthesis following the
requirement number, e.g., FIA_UAU.1.1(1); the iterated requirement titles are similarly indicated, e.g.,
FIA_UAU.1(1).
Assignments made by the ST author are identified with bold text.
Selections are identified with underlined text.
Refinements that add text use bold and italicized text to identify the added text. Refinements that
performs a deletion, identifies the deleted text with strikeout, bold, and italicized text.
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2 Conformance Claims
2.1 Common Criteria Conformance Claims
This Security Target is conformant to the Common Criteria Version 3.1r3.
2.2 Conformance to Protection Profiles
This Security Target claims exact conformance to the Network Device Protection Profile, Version 1.1,
dated June 8, 2012 [11], including the Security Requirements for Network Devices Errata #1 [12].
2.3 Conformance to Security Packages
This Security Target does not claim conformance to any security function requirements package, neither
as package‐conformant or package‐augmented.
2.4 Conformance Claims Rationale
The ST claims exact conformance to the Network Device Protection Profile, Version 1.1, June 8, 2012.
This Protection Profile will be called NDPP or PP for convenience through this Security Target.
The following address the completeness of the threats, OSP, objectives, and limitations on the
assumptions:
 Threats
o All threats defined in the NDPP are carried forward to this ST
o No additional threats have been defined in this ST
 Organizational Security Policies
o All OSP defined in the NDPP are carried forward to this ST;
o No additional OSP have been defined in this ST.
 Assumptions
o All assumptions defined in the NDPP are carried forward to this ST;
o No additional assumptions for the operational environment have been defined in this ST
 Objectives
o All objectives defined in the NDPP are carried forward to this ST
All SFRs and SARs defined in the NDPP are carried forward to this Security Target.
Rationale presented in the body of this ST shows all assumptions on the operational environment have
been upheld, all the OSP are enforced, all defined objectives have been met and these objectives
counter the defined threats.
Additionally, all SFRs and SARs defined in the NDPP have been properly instantiated in this Security
Target; therefore, this ST shows exact conformance to the NDPP.
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3 Security Problem Definition
3.1 Threats
The following table defines the security threats for the TOE, characterized by a threat agent, an asset,
and an adverse action of that threat agent on that asset. These threats are taken directly from the PP
unchanged.
Table 5: Threats
Threat Description
T.ADMIN_ERROR An administrator may unintentionally install or configure the TOE incorrectly,
resulting in ineffective security mechanisms.
T.TSF_FAILURE Security mechanisms of the TOE may fail, leading to a compromise of the TSF.
T.UNDETECTED_ACTIONS Malicious remote users or external IT entities may take actions that adversely
affect the security of the TOE. These actions may remain undetected and thus
their effects cannot be effectively mitigated.
T.UNAUTHORIZED_ACCESS A user may gain unauthorized access to the TOE data and TOE executable code. A
malicious user, process, or external IT entity may masquerade as an authorized
entity in order to gain unauthorized access to data or TOE resources. A malicious
user, process, or external IT entity may misrepresent itself as the TOE to obtain
identification and authentication data.
T.UNAUTHORIZED_UPDATE A malicious party attempts to supply the end user with an update to the product
that may compromise the security features of the TOE.
T.USER_DATA_REUSE User data may be inadvertently sent to a destination not intended by the original
sender.
3.2 Organizational Security Policies
The following table defines the organizational security policies which are a set of rules, practices, and
procedures imposed by an organization to address its security needs. These threats are taken directly
from the PP unchanged.
Table 6: Organizational Security Policies
OSP Description
P.ACCESS_BANNER The TOE shall display an initial banner describing restrictions of use, legal
agreements, or any other appropriate information to which users consent
by accessing the TOE.
3.3 Assumptions
This section describes the assumptions that are made on the operational environment in which the TOE
is intended to be used in order to be able to provide security functionality. It includes information about
the physical, personnel, and connectivity aspects of the environment. The operational environment
must be managed in accordance with the provided guidance documentation. The following table defines
specific conditions that are assumed to exist in an environment where the TOE is deployed. These
assumptions are taken directly from the PP unchanged.
Table 7: Assumptions
Assumption Description
A.NO_GENERAL_PURPOSE It is assumed that there are no general‐purpose computing capabilities (e.g.,
compilers or user applications) available to the TOE, other than those services
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Table 7: Assumptions
Assumption Description
necessary for the operation, administration and support of the TOE.
A.PHYSICAL Physical security, commensurate with the value of the TOE and the data it
contains, is assumed to be provided by the environment.
A.TRUSTED_ADMIN TOE Administrators are trusted to follow and apply all administrator guidance
in a trusted manner.
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4 Security Objectives
4.1 Security Objectives for the TOE
Table 8: Security Objectives for the TOE
TOE Objective Description
O.PROTECTED_COMMUNICATIONS The TOE will provide protected communication channels for
administrators, other parts of a distributed TOE, and authorized
IT entities.
O.VERIFIABLE_UPDATES The TOE will provide the capability to help ensure that any
updates to the TOE can be verified by the administrator to be
unaltered and (optionally) from a trusted source.
O.SYSTEM_MONITORING The TOE will provide the capability to generate audit data and
send those data to an external IT entity.
O.DISPLAY_BANNER The TOE will display an advisory warning regarding use of the
TOE.
O.TOE_ADMINISTRATION The TOE will provide mechanisms to ensure that only
administrators are able to log in and configure the TOE, and
provide protections for logged‐in administrators.
O.RESIDUAL_INFORMATION_CLEARING The TOE will ensure that any data contained in a protected
resource is not available when the resource is reallocated.
O.SESSION_LOCK The TOE shall provide mechanisms that mitigate the risk of
unattended sessions being hijacked.
O.TSF_SELF_TEST The TOE will provide the capability to test some subset of its
security functionality to ensure it is operating properly.
4.2 Security Objectives for the Operational Environment
Table 9: Security Objectives for the Operational Environment
Objective Description
OE.NO_GENERAL_PURPOSE There are no general‐purpose computing capabilities (e.g., compilers or user
applications) available to the TOE, other than those services necessary for the
operation, administration and support of the TOE.
OE.PHYSICAL Physical security, commensurate with the value of the TOE and the data it
contains, is assumed to be provided by the IT environment.
OE.TRUSTED_ADMIN TOE Administrators are trusted to follow and apply all administrator guidance
in a trusted manner.
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5 Extended Components Definition
This section provides definition of the extended security functional and assurance requirements; the
components that are CC Part 2 extended, and CC Part 3 extended, i.e., NIAP interpreted requirements,
and extended requirements.
5.1 Extended Security Functional Requirements Definitions
There are no extended Security Functional Requirements defined in this Security Target. All extended
SFRs were taken from the NDPP.
5.2 Extended Security Assurance Requirement Definitions
There are no extended Security Assurance Requirements defined in this Security Target. All extended
SARs were taken from the NDPP.
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6 Security Requirements
This section describes the security functional and assurance requirements for the TOE.
6.1 Security Function Requirements
This section describes the functional requirements for the TOE. The security functional requirement
components in this security target are CC Part 2 conformant or CC Part 2 extended as defined in Section
2, Conformance Claims. Operations that were performed in the NDPP are not signified in this section.
Operations performed by the ST are denoted according to the formatting conventions in section 1.5.
6.1.1 Security Audit (FAU)
6.1.1.1 FAU_GEN.1 Audit Data Generation
FAU_GEN.1.1 The TSF shall be able to generate an audit record for the following auditable
events:
a) Start‐up of the audit functions;
b) All auditable events for the not specified level of audit; and
c) All administrative actions;
d) Specifically defined auditable events listed in Table 10.
Table 10: Auditable Events
# SFR Auditable Events Additional Audit Record Contents
1. FAU_GEN.1 None.
2. FAU_GEN.2 None.
3. FAU_STG_EXT.1 None.
4. FCS_CKM_EXT.4 None.
5. FCS_COP.1(1) None.
6. FCS_COP.1(2) None.
7. FCS_COP.1(3) None.
8. FCS_COP.1(4) None.
9. FCS_RGB_EXT.1 None.
10. FDP_RIP.2 None.
11. FIA_PMG_EXT.1 None.
12. FIA_UIA_EXT.1
All use of the identification and
authentication mechanism.
Provided user identity, origin of the attempt
(e.g., IP address).
13. FIA_UAU_EXT.1
All use of the authentication
mechanism.
Origin of the attempt (e.g., IP address).
14. FIA_UAU.7 None.
15. FMT_MTD.1 None.
16. FMT_SMF.1 None.
17. FMT_SMR.2 None.
18. FPT_SKP_EXT.1 None.
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Table 10: Auditable Events
# SFR Auditable Events Additional Audit Record Contents
19. FPT_APW_EXT.1 None.
20. FPT_STM.1 Changes to the time.
The old and new values for the time. Origin of
the attempt (e.g., IP address).
21. FPT_TUD_EXT.1 Initiation of update. No additional information.
22. FPT_TST_EXT.1 None.
23. FTA_SSL_EXT.1
Any attempts at unlocking of an
interactive session.
No additional information.
24. FTA_SSL.3
The termination of a remote
session by the session locking
mechanism.
No additional information.
25. FTA_SSL.4
The termination of an interactive
session.
No additional information.
26. FTA_TAB.1 None.
27. FTP_ITC.1
Initiation of the trusted channel.
Termination of the trusted
channel.
Failure of the trusted channel
functions.
Identification of the initiator and target of failed
trusted channels establishment attempt.
28. FTP_TRP.1
Initiation of the trusted channel.
Termination of the trusted
channel.
Failure of the trusted channel
functions.
Identification of the claimed user identity.
29. FCS_SSH_EXT.1
Failure to establish an SSH
session.
Establishment/Termination of an
SSH session.
Reason for failure.
Non‐TOE endpoint of connection (IP address) for
both successes and failures.
PP Application Note: The ST author can include other auditable events directly in the table; they
are not limited to the list presented.
Many auditable aspects of the SFRs included in this document deal with
administrative actions. Item c above requires all administrative actions to be
auditable, so no additional specification of the auditability of these actions is
specified in Table 10.
Assurance Activity: The evaluator shall check the administrative guide and ensure that it lists all
of the auditable events and provides a format for audit records. Each audit
record format type must be covered, along with a brief description of each
field. The evaluator shall check to make sure that every audit event type
mandated by the PP is described and that the description of the fields
contains the information required in FAU_GEN.1.2, and the additional
information specified in Table 1
The evaluator shall also make a determination of the administrative actions
that are relevant in the context of the NDPP. The evaluator shall examine
the administrative guide and make a determination of which administrative
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commands, including subcommands, scripts, and configuration files, are
related to the configuration (including enabling or disabling) of the
mechanisms implemented in the TOE that are necessary to enforce the
requirements specified in the PP. The evaluator shall document the
methodology or approach taken while determining which actions in the
administrative guide are security relevant with respect to the NDPP. The
evaluator may perform this activity as part of the activities associated with
ensuring the AGD_OPE guidance satisfies the requirements.
The evaluator shall test the TOE’s ability to correctly generate audit records
by having the TOE generate audit records for the events listed in Table 10
and administrative actions. This should include all instances of an event‐‐for
instance, if there are several different I&A mechanisms for a system, the
FIA_UIA_EXT.1 events must be generated for each mechanism. The
evaluator shall test that audit records are generated for the establishment
and termination of a channel for each of the cryptographic protocols
contained in the ST. If HTTPS is implemented, the test demonstrating the
establishment and termination of a TLS session can be combined with the
test for an HTTPS session. For administrative actions, the evaluator shall test
that each action determined by the evaluator above to be security relevant
in the context of the NDPP is auditable. When verifying the test results, the
evaluator shall ensure the audit records generated during testing match the
format specified in the administrative guide, and that the fields in each
audit record have the proper entries
Note that the testing here can be accomplished in conjunction with the
testing of the security mechanisms directly. For example, testing performed
to ensure that the administrative guidance provided is correct verifies that
AGD_OPE.1 is satisfied and should address the invocation of the
administrative actions that are needed to verify the audit records are
generated as expected.
FAU_GEN.1.2 The TSF shall record within each audit record at least the following
information:
1. Date and time of the event, type of event, subject identity, and the
outcome (success or failure) of the event; and
2. For each audit event type, based on the auditable event definitions
of the functional components included in the PP/ST, information
specified in column three of Table 10.
PP Application Note: As with the previous component, the ST author should update Table 10
above with any additional information generated. "Subject identity" in the
context of this requirement could either be the administrator's user id or the
affected network interface, for example.
Assurance Activity: This activity should be accomplished in conjunction with the testing of
FAU_GEN.1.1.
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6.1.1.2 FAU_GEN.2 User Identity Association
FAU_GEN.2.1 For audit events resulting from actions of identified users, the TSF shall be
able to associate each auditable event with the identity of the user that
caused the event.
Assurance Activity: This activity should be accomplished in conjunction with the testing of
FAU_GEN.1.1.
6.1.1.3 FAU_STG_EXT.1 External Audit Trail Storage
FAU_STG_EXT.1.1 The TSF shall be able to transmit the generated audit data to an external IT
entity using a trusted channel implementing the SSH protocol.
PP Application Note: For applications of the NDPP to TOEs that do not act as audit servers, the
TOE relies on a non‐TOE audit server for storage and review of audit records.
Although the TOE generates audit records, the storage of these audit records
and the ability to allow the administrator to review these audit records is
provided by the operational environment. The ST author chooses the first
clause of the first selection in these cases. The NDPP can also be used to
specify requirements for an audit server; in this case the second clause of the
first selection is used.
In the second selection, the ST author chooses the means by which this
connection is protected. The ST author also ensures that the supporting
protocol requirement matching the selection is included in the ST.
Assurance Activity: For both types of TOEs (those that act as an audit server and those that
send data to an external audit server), there is some amount of local
storage. The evaluator shall examine the TSS to ensure it describes the
amount of audit data that are stored locally; what happens when the local
audit data store is full; and how these records are protected against
unauthorized access. The evaluator shall also examine the operational
guidance to determine that it describes the relationship between the local
audit data and the audit data that are sent to the audit log server (for TOEs
that are not acting as an audit log server). For example, when an audit event
is generated, is it simultaneously sent to the external server and the local
store, or is the local store used as a buffer and “cleared” periodically by
sending the data to the audit server.
TOE acts as audit server: The evaluator shall examine the TSS to ensure it describes the connection
supported from non‐TOE entities to send the audit data to the TOE, and
how the trusted channel is provided. Testing of the trusted channel
mechanism will be performed as specified in the associated assurance
activities for the particular trusted channel mechanism. The evaluator shall
also examine the operational guidance to ensure it describes how to
establish the trusted channel with the TOE, as well as describe any
requirements for other IT entities to connect and send audit data to the TOE
(particular audit server protocol, version of the protocol required, etc.), as
well as configuration of the TOE needed to communicate with other IT
entities. The evaluator shall perform the following test for this requirement:
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Test 1: The evaluator shall establish a session between an external IT entity
and the TOE according to the configuration guidance provided. The
evaluator shall then examine the traffic that passes between the IT entity
and the TOE during several activities of the TOE. The evaluator shall observe
that these data are not able to be viewed in the clear during this transfer,
and that they are successfully received by the TOE. The evaluator shall
perform this test for each protocol selected in the second selection.
TOE is not an audit server: The evaluator shall examine the TSS to ensure it describes the means by
which the audit data are transferred to the external audit server, and how
the trusted channel is provided. Testing of the trusted channel mechanism
will be performed as specified in the associated assurance activities for the
particular trusted channel mechanism. The evaluator shall also examine the
operational guidance to ensure it describes how to establish the trusted
channel to the audit server, as well as describe any requirements on the
audit server (particular audit server protocol, version of the protocol
required, etc.), as well as configuration of the TOE needed to communicate
with the audit server. The evaluator shall perform the following test for this
requirement:
Test 1: The evaluator shall establish a session between the TOE and the
audit server according to the configuration guidance provided. The
evaluator shall then examine the traffic that passes between the audit
server and the TOE during several activities of the evaluator’s choice
designed to generate audit data to be transferred to the audit server. The
evaluator shall observe that these data are not able to be viewed in the
clear during this transfer, and that they are successfully received by the
audit server. The evaluator shall record the particular software (name,
version) used on the audit server during testing.
6.1.2 Cryptographic Support (FCS)
6.1.2.1 FCS_CKM.1 Cryptographic Key Generation (for asymmetric keys)
FCS_CKM.1.1(1) The TSF shall generate asymmetric cryptographic keys used for key
establishment in accordance with
1. NIST Special Publication 800‐56A. “Recommendation for Pair‐Wise
Key Establishment Schemes Using Discrete Logarithm
Cryptography” for finite field‐based key establishment schemes;
and specified cryptographic key sizes equivalent to, or greater than, a
symmetric key strength of 112 bits.
FCS_CKM.1.1(2) The TSF shall generate asymmetric cryptographic keys used for key
establishment in accordance with
2. NIST Special Publication 800‐56B, “Recommendation for Pair‐Wise
Key Establishment Schemes Using Integer Factorization
Cryptography” for RSA‐based key establishment schemes
and specified cryptographic key sizes equivalent to, or greater than, a
symmetric key strength of 112 bits.
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PP Application Note: This component requires that the TOE be able to generate the public/private
key pairs that are used for key establishment purposes for the various
cryptographic protocols used by the TOE (e.g., IPsec). If multiple schemes are
supported, then the ST author should iterate this requirement to capture this
capability. The scheme used will be chosen by the ST author from the
selection.
Since the domain parameters to be used are specified by the requirements of
the protocol in the NDPP, it is not expected that the TOE will generate
domain parameters, and therefore there is no additional domain parameter
validation needed when the TOE complies to the protocols specified in the
NDPP.
SP 800‐56B references (but does not mandate) key generation according to
FIPS 186‐3. For purposes of compliance in this version of the NDPP, RSA key
pair generation according to FIPS 186‐2 or FIPS 186‐3 is allowed in order for
the TOE to claim conformance to SP 800‐56B.
The generated key strength of 2048‐bit DSA and rDSA keys need to be
equivalent to, or greater than, a symmetric key strength of 112 bits. See
NIST Special Publication 800‐57, “Recommendation for Key Management”
for information about equivalent key strengths.
Assurance Activity: The evaluator shall use the key pair generation portions of "The FIPS 186‐3
Digital Signature Algorithm Validation System (DSA2VS)", "The FIPS 186‐3
Elliptic Curve Digital Signature Algorithm Validation System (ECDSA2VS)",
and either "The RSA Validation System (RSAVS)" (for FIPS 186‐2) or “The
186‐3 RSA Validation System (RSA2VS)” (for FIPS 186‐3) as a guide in testing
the requirement above, depending on the selection performed by the ST
author. This will require that the evaluator have a trusted reference
implementation of the algorithms that can produce test vectors that are
verifiable during the test.
The evaluator shall ensure that the TSS contains a description of how the
TSF complies with 800‐56A and/or 800‐56B, depending on the selections
made. This description shall indicate the sections in 800‐56A and/or 800‐
56B that are implemented by the TSF, and the evaluator shall ensure that
key establishment is among those sections that the TSF claims to
implement.
Any TOE‐specific extensions, processing that is not included in the
documents, or alternative implementations allowed by the documents that
may impact the security requirements the TOE is to enforce shall be
described.
6.1.2.2 FCS_CKM_EXT.4 Cryptographic Key Zeroization
FCS_CKM_EXT.4.1 The TSF shall zeroize all plaintext secret and private cryptographic keys and
CSPs when no longer required.
PP Application Note: “Cryptographic Critical Security Parameters” are defined in FIPS 140‐2 as
“security‐related information (e.g., secret and private cryptographic keys,
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and authentication data such as passwords and PINs) whose disclosure or
modification can compromise the security of a cryptographic module.”
The zeroization indicated above applies to each intermediate storage area
for plaintext key/cryptographic critical security parameter (i.e., any storage,
such as memory buffers, that is included in the path of such data) upon the
transfer of the key/cryptographic critical security parameter to another
location.
Assurance Activity The evaluator shall check to ensure the TSS describes each of the secret
keys (keys used for symmetric encryption), private keys, and CSPs used to
generate key; when they are zeroized (for example, immediately after use,
on system shutdown, etc.); and the type of zeroization procedure that is
performed (overwrite with zeros, overwrite three times with random
pattern, etc.). If different types of memory are used to store the materials
to be protected, the evaluator shall check to ensure that the TSS describes
the zeroization procedure in terms of the memory in which the data are
stored (for example, "secret keys stored on flash are zeroized by overwriting
once with zeros, while secret keys stored on the internal hard drive are
zeroized by overwriting three times with a random pattern that is changed
before each write").
6.1.2.3 FCS_COP.1(1) Cryptographic Operation (for data encryption/decryption)
FCS_COP.1.1(1) The TSF shall perform encryption and decryption in accordance with a
specified cryptographic algorithm AES operating in CBC mode and
cryptographic key sizes 128‐bits, 256‐bits, and no other key sizes that meets
the following:
1. FIPS PUB 197, “Advanced Encryption Standard (AES)”
2. NIST SP 800‐38A
PP Application Note: Application Note: For the assignment, the ST author should choose the mode
or modes in which AES operates. For the first selection, the ST author should
choose the key sizes that are supported by this functionality. For the second
selection, the ST author should choose the standards that describe the
modes specified in the assignment.
Assurance Activity: The evaluator shall use tests appropriate to the modes selected in the above
requirement from "The Advanced Encryption Standard Algorithm Validation
Suite (AESAVS)", "The XTS‐AES Validation System (XTSVS)", The CMAC
Validation System (CMACVS)", "The Counter with Cipher Block Chaining‐
Message Authentication Code (CCM) Validation System (CCMVS)", and "The
Galois/Counter Mode (GCM) and GMAC Validation System (GCMVS)" (these
documents are available from
http://csrc.nist.gov/groups/STM/cavp/index.html) as a guide in testing the
requirement above. This will require that the evaluator have a reference
implementation of the algorithms known to be good that can produce test
vectors that are verifiable during the test
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6.1.2.4 FCS_COP.1(2) Cryptographic Operations (for cryptographic signature)
FCS_COP.1.1(2) The TSF shall perform cryptographic signature services in accordance with a
a) RSA Digital Signature Algorithm (rDSA) with a key size (modulus) of 2048
bits or greater
that meets the following:
Case: RSA Digital Signature Algorithm
FIPS PUB 186‐2 or FIPS PUB 186‐3, “Digital Signature Standard”
PP Application Note: Application Note: The ST Author should choose the algorithm implemented
to perform digital signatures; if more than one algorithm is available, this
requirement (and the corresponding FCS_CKM.1 requirement) should be
iterated to specify the functionality. For the algorithm chosen, the ST author
should make the appropriate assignments/selections to specify the
parameters that are implemented for that algorithm.
For elliptic curve‐based schemes, the key size refers to the log2 of the order
of the base point. As the preferred approach for digital signatures, ECDSA
will be required in future publications of the NDPP.
Assurance Activity: The evaluator shall use the signature generation and signature verification
portions of "The Digital Signature Algorithm Validation System” (DSA2VS),
"The Elliptic Curve Digital Signature Algorithm Validation System”
(ECDSA2VS), and "The RSA Validation System” (RSAVS (for 186‐2) or RSA2VS
(for 1806‐3)) as a guide in testing the requirement above. The Validation
System used shall comply with the conformance standard identified in the
ST (i.e., FIPS PUB 186‐2 or FIPS PUB 186‐3). This will require that the
evaluator have a reference implementation of the algorithms known to be
good that can produce test vectors that are verifiable during the test.
6.1.2.5 FCS_COP.1(3) Cryptographic Operation (for cryptographic hashing)
FCS_COP.1.1(3) The TSF shall perform cryptographic hashing services in accordance with a
specified cryptographic algorithm SHA‐1 and SHA‐512 and message digest
sizes 160 and 512 bits that meet the following: FIPS Pub 180‐3, “Secure
Hash Standard.”
PP Application Note: The selection of the hashing algorithm must correspond to the selection of
the message digest size; for example, if SHA‐1 is chosen, then the only valid
message digest size selection would be 160 bits.
In subsequent publications of the NDPP, it is likely that SHA‐1 will no longer
be an approved algorithm for cryptographic hashing.
Assurance Activity: The evaluator shall use "The Secure Hash Algorithm Validation System
(SHAVS)" as a guide in testing the requirement above. This will require that
the evaluator have a reference implementation of the algorithms known to
be good that can produce test vectors that are verifiable during the test.
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6.1.2.6 FCS_COP.1(4) Cryptographic Operation (for keyed hash message
authentication)
FCS_COP.1.1(4) The TSF shall perform keyed‐hash message authentication in accordance
with a specified cryptographic algorithm HMAC‐SHA‐1 key size 160 and
message digest sizes 160 bits that meet the following: FIPS Pub 198‐1, "The
Keyed‐Hash Message Authentication Code, and FIPS Pub 180‐3, “Secure
Hash Standard.”
PP Application Note: In future versions of the NDPP, SHA‐1 may be removed as a valid hash
algorithm. Developers are encouraged to transition to the other listed hash
algorithms.
Assurance Activity: The evaluator shall use "The Keyed‐Hash Message Authentication Code
(HMAC) Validation System (HMACVS)" as a guide in testing the requirement
above. This will require that the evaluator have a reference implementation
of the algorithms known to be good that can produce test vectors that are
verifiable during the test.
6.1.2.7 FCS_SSH_EXT.1 SSH
FCS_SSH_EXT.1.1 The TSF shall implement the SSH protocol that complies with RFCs 4251,
4252, 4253, 4254, and no other RFCs.
PP Application Note: The ST author selects which of the additional RFCs to which conformance is
being claimed. Note that these need to be consistent with selections in later
elements of this component (e.g., cryptographic algorithms permitted).
In the next version of the NDPP, a requirement will be added regarding
rekeying. The requirement will read “The TSF shall ensure that the SSH
connection be rekeyed after no more than 228
packets have been transmitted
using that key.”
FCS_SSH_EXT.1.2 The TSF shall ensure that the SSH protocol implementation supports the
following authentication methods as described in RFC 4252: public key‐
based, password‐based.
Assurance Activity: The evaluator shall check to ensure that the TSS contains a description of
the public key algorithms that are acceptable for use for authentication,
that this list conforms to FCS_SSH_EXT.1.5, and ensure that password‐based
authentication methods are also allowed. The evaluator shall also perform
the following tests:
1. Test 1: The evaluator shall, for each public key algorithm supported,
show that the TOE supports the use of that public key algorithm to
authenticate a user connection. Any configuration activities
required to support this test shall be performed according to
instructions in the operational guidance.
2. Test 2: Using the operational guidance, the evaluator shall configure
the TOE to accept password‐based authentication, and demonstrate
that a user can be successfully authenticated to the TOE over SSH
using a password as an authenticator.
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FCS_SSH_EXT.1.3 The TSF shall ensure that, as described in RFC 4253, packets greater than
262144 bytes in an SSH transport connection are dropped.
PP Application Note: RFC 4253 provides for the acceptance of “large packets” with the caveat
that packets should be of “reasonable length” or dropped. The assignment
should be filled in by the ST author with the maximum packet size accepted,
thus defining “reasonable length” for the TOE.
Assurance Activity: The evaluator shall check that the TSS describes how “large packets” in
terms of RFC 4253 are detected and handled. The evaluator shall also
perform the following test:
1. Test 1: The evaluator shall demonstrate that if the TOE receives a
packet larger than that specified in this component, that packet is
dropped.
FCS_SSH_EXT.1.4 The TSF shall ensure that the SSH transport implementation uses the
following encryption algorithms: AES‐CBC‐128, AES‐CBC‐256, no other
algorithms.
PP Application Note: In the assignment, the ST author can select the AES‐GCM algorithms, or "no
other algorithms" if AES‐GCM is not supported. If AES‐GCM is selected, there
should be corresponding FCS_COP entries in the ST. Since the Dec. 2010
publication of NDPP v1.0, there has been consider progress with respect to
the prevalence of AES‐GCM support in commercial network devices. It is
likely that an NDPP v2.0 will be published in late 2012 which will require
AES‐GCM and AES‐CBC will become optional.
Assurance Activity: The evaluator shall check the description of the implementation of this
protocol in the TSS to ensure that optional characteristics are specified, and
the encryption algorithms supported are specified as well. The evaluator
shall check the TSS to ensure that the encryption algorithms specified are
identical to those listed for this component. The evaluator shall also check
the operational guidance to ensure that it contains instructions on
configuring the TOE so that SSH conforms to the description in the TSS (for
instance, the set of algorithms advertised by the TOE may have to be
restricted to meet the requirements). The evaluator shall also perform the
following test:
1. Test 1: The evaluator shall establish a SSH connection using each of
the encryption algorithms specified by the requirement. It is
sufficient to observe (on the wire) the successful negotiation of the
algorithm to satisfy the intent of the test.
FCS_SSH_EXT.1.5 The TSF shall ensure that the SSH transport implementation uses SSH_RSA
and no other public key algorithms as its public key algorithm(s).
PP Application Note: RFCs 4253 and 5656 specify required and allowable public key algorithms.
This requirement makes SSH‐RSA “required” and allows the others to be
claimed in the ST. The ST author should make the appropriate selection,
selecting "no other public key algorithms" if only SSH_RSA is implemented.
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Assurance Activity: The assurance activity associated with FCS_SSH_EXT.1.4 verifies this
requirement.
FCS_SSH_EXT.1.6 The TSF shall ensure that data integrity algorithms used in SSH transport
connection is hmac‐sha1.
PP Application Note: RFC 6668 specifies the use of the sha2 algorithms in SSH.
Assurance Activity: The evaluator shall check the TSS to ensure that it lists the supported data
integrity algorithms, and that that list corresponds to the list in this
component. The evaluator shall also check the operational guidance to
ensure that it contains instructions to the administrator on how to ensure
that only the allowed data integrity algorithms are used in SSH connections
with the TOE (specifically, that the “none” MAC algorithm is not allowed).
The evaluator shall also perform the following test:
1. Test 1: The evaluator shall establish a SSH connection using each of
the integrity algorithms specified by the requirement. It is
sufficient to observe (on the wire) the successful negotiation of the
algorithm to satisfy the intent of the test.
FCS_SSH_EXT.1.7 The TSF shall ensure that diffie‐hellman‐group14‐sha1 and no other
methods are the only allowed key exchange method used for the SSH
protocol.
Assurance Activity: The evaluator shall ensure that operational guidance contains configuration
information that will allow the security administrator to configure the TOE
so that all key exchanges for SSH are performed using DH group 14 and any
groups specified from the selection in the ST. If this capability is “hard‐
coded” into the TOE, the evaluator shall check the TSS to ensure that this is
stated in the discussion of the SSH protocol. The evaluator shall also
perform the following test:
1. Test 1: The evaluator shall attempt to perform a diffie‐hellman‐
group1‐sha1 key exchange, and observe that the attempt fails. For
each allowed key exchange method, the evaluator shall then
attempt to perform a key exchange using that method, and observe
that the attempt succeeds.
6.1.2.8 FCS_RBG_EXT.1 Cryptographic Operation (Random Bit Generation)
FCS_RBG_EXT.1.1 The TSF shall perform all random bit generation (RBG) services in
accordance with FIPS Pub 140‐2 Annex C: X9.31 Appendix 2.4 using AES
seeded by an entropy source that accumulated entropy from a TSF‐
hardware‐based noise source.
FCS_RBG_EXT.1.2 The deterministic RBG shall be seeded with a minimum of 256 bits of
entropy at least equal to the greatest security strength of the keys and
hashes that it will generate.
PP Application Note: NIST Special Pub 800‐90B describes the minimum entropy measurement
that will probably be required future versions of FIPS‐140. If possible this
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should be used immediately and will be required in future versions of the
NDPP.
For the first selection in FCS_RBG_EXT.1.1, the ST author should select the
standard to which the RBG services comply (either 800‐90B or 140‐2 Annex
C).
SP 800‐90B contains four different methods of generating random numbers;
each of these, in turn, depends on underlying cryptographic primitives (hash
functions/ciphers). The ST author will select the function used (if 800‐90B is
selected), and include the specific underlying cryptographic primitives used
in the requirement or in the TSS. While any of the identified hash functions
(SHA‐1, SHA‐224, SHA‐256, SHA‐384, SHA‐512) are allowed for Hash_DRBG
or HMAC_DRBG, only AES‐based implementations for CT_DRBG are allowed.
While any of the curves defined in 800‐90B are allowed for Dual_EC_DRBG,
the ST author not only must include the curve chosen, but also the hash
algorithm used.
For the second selection in FCS_RBG_EXT.1.1, the ST author indicates
whether the sources of entropy are software‐based, hardware‐based, or
both. If there are multiple sources of entropy, the ST will elaborate each
entropy sources and whether it is hardware‐ or software‐based. Hardware‐
based noise sources are preferred.
Note that for FIPS Pub 140‐2 Annex C, currently only the method described in
NIST‐Recommended Random Number Generator Based on ANSI X9.31
Appendix A.2.4 Using the 3‐Key Triple DES and AES Algorithms, Section 3 is
valid. If the key length for the AES implementation used here is different
than that used to encrypt the user data, then FCS_COP.1 may have to be
adjusted or iterated to reflect the different key length. For the selection in
FCS_RBG_EXT.1.2, the ST author selects the minimum number of bits of
entropy that is used to seed the RBG.
The ST author also ensures that any underlying functions are included in the
baseline requirements for the TOE.
For the selection in FCS_RBG_EXT.1.2, the ST author selects the appropriate
number of bits of entropy that corresponds to the greatest security strength
of the algorithms included in the ST. Security strength is defined in Tables 2
and 3 of NIST SP 800‐57A. For example, if the implementation includes
2048‐bit RSA (security strength of 112 bits), AES 128 (security strength 128
bits), and HMAC‐512 (security strength 256 bits), then the ST author would
select 256 bits.
Assurance Activity: Documentation shall be produced – and the evaluator shall perform the
activities – in accordance with Annex D, Entropy Documentation and
Assessment.
The evaluator shall also perform the following tests, depending on the
standard to which the RBG conforms.
Implementations Conforming to FIPS 140‐2, Annex C
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The reference for the tests contained in this section is The Random Number
Generator Validation System (RNGVS) [RNGVS]. The evaluator shall conduct
the following two tests. Note that the "expected values" are produced by a
reference implementation of the algorithm that is known to be correct.
Proof of correctness is left to each Scheme.
The evaluator shall perform a Variable Seed Test. The evaluator shall
provide a set of 128 (Seed, DT) pairs to the TSF RBG function, each 128 bits.
The evaluator shall also provide a key (of the length appropriate to the AES
algorithm) that is constant for all 128 (Seed, DT) pairs. The DT value is
incremented by 1 for each set. The seed values shall have no repeats within
the set. The evaluator ensures that the values returned by the TSF match
the expected values.
The evaluator shall perform a Monte Carlo Test. For this test, they supply an
initial Seed and DT value to the TSF RBG function; each of these is 128 bits.
The evaluator shall also provide a key (of the length appropriate to the AES
algorithm) that is constant throughout the test. The evaluator then invokes
the TSF RBG 10,000 times, with the DT value being incremented by 1 on
each iteration, and the new seed for the subsequent iteration produced as
specified in NIST‐Recommended Random Number Generator Based on ANSI
X9.31 Appendix A.2.4 Using the 3‐Key Triple DES and AES Algorithms,
Section 3. The evaluator ensures that the 10,000th
value produced matches
the expected value.
Implementations Conforming to NIST Special Publication 800‐90
The evaluator shall perform 15 trials for the RBG implementation. If the RBG
is configurable, the evaluator shall perform 15 trials for each configuration.
The evaluator shall also confirm that the operational guidance contains
appropriate instructions for configuring the RBG functionality.
If the RBG has prediction resistance enabled, each trial consists of (1)
instantiate drbg, (2) generate the first block of random bits, (3) generate a
second block of random bits, (4) uninstantiate. The evaluator verifies that
the second block of random bits is the expected value. The evaluator shall
generate eight input values for each trial. The first is a count (0 ‐ 14). The
next three are entropy input, nonce, and personalization string for the
instantiate operation. The next two are additional input and entropy input
for the first call to generate. The final two are additional input and entropy
input for the second call to generate. These values are randomly generated.
“generate one block of random bits” means to generate random bits with
number of returned bits equal to the Output Block Length (as defined in
NIST SP 800‐90).
If the RBG does not have prediction resistance, each trial consists of (1)
instantiate drbg, (2) generate the first block of random bits, (3) reseed, (4)
generate a second block of random bits, (5) uninstantiate. The evaluator
verifies that the second block of random bits is the expected value. The
evaluator shall generate eight input values for each trial. The first is a count
(0 ‐ 14). The next three are entropy input, nonce, and personalization string
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for the instantiate operation. The fifth value is additional input to the first
call to generate. The sixth and seventh are additional input and entropy
input to the call to reseed. The final value is additional input to the second
generate call.
The following paragraphs contain more information on some of the input
values to be generated/selected by the evaluator.
1. Entropy input: the length of the entropy input value must equal the
seed length.
2. Nonce: If a nonce is supported (CTR_DRBG with no df does not use a
nonce), the nonce bit length is one‐half the seed length.
3. Personalization string: The length of the personalization string must
be <= seed length. If the implementation only supports one
personalization string length, then the same length can be used for
both values. If more than one string length is support, the evaluator
shall use personalization strings of two different lengths. If the
implementation does not use a personalization string, no value
needs to be supplied.
4. Additional input: the additional input bit lengths have the same
defaults and restrictions as the personalization string lengths.
6.1.3 User Data Protection (FDP)
6.1.3.1 FDP_RIP.2 Full Residual Information Protection
FDP_RIP.2.1 The TSF shall ensure that any previous information content of a resource is
made unavailable upon the allocation of the resource to all objects.
Assurance Activity: “Resources” in the context of this requirement are network packets being
sent through (as opposed to “to”, as is the case when a security
administrator connects to the TOE) the TOE. The concern is that once a
network packet is sent, the buffer or memory area used by the packet still
contains data from that packet, and that if that buffer is re‐used, those data
might remain and make their way into a new packet. The evaluator shall
check to ensure that the TSS describes packet processing to the extent that
they can determine that no data will be reused when processing network
packets. The evaluator shall ensure that this description at a minimum
describes how the previous data are zeroized/overwritten, and at what
point in the buffer processing this occurs.
6.1.4 Identification and Authentication (FIA)
6.1.4.1 FIA_PMG_EXT.1 Password Management
FIA_PMG_EXT.1.1 The TSF shall provide the following password management capabilities for
administrative passwords:
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1. Passwords shall be able to be composed of any combination of
upper and lower case letters, numbers, and the following special
characters: “!”, “@”, “$”, “%”, “^”, “&”, “*”, “#”, “\”, “‐”, “_”, “=”,
“+”, “\”, “; ”, “: ”, “'”, “"”, “<”, “>”, “,”, “.”, “?”, “/”, “`”, “~”
2. Minimum password length shall settable by the Security
Administrator, and support passwords of 15 characters or greater;
PP Application Note: The ST author selects the special characters that are supported by TOE; they
may optionally list additional special characters supported using the
assignment. "Administrative passwords" refers to passwords used by
administrators at the local console or over protocols that support
passwords, such as SSH and HTTPS.
Assurance Activity: The evaluator shall examine the operational guidance to determine that it
provides guidance to security administrators on the composition of strong
passwords, and that it provides instructions on setting the minimum
password length. The evaluator shall also perform the following tests. Note
that one or more of these tests can be performed with a single test case.
1. Test 1: The evaluator shall compose passwords that either meet the
requirements, or fail to meet the requirements, in some way. For
each password, the evaluator shall verify that the TOE supports the
password. While the evaluator is not required (nor is it feasible) to
test all possible compositions of passwords, the evaluator shall
ensure that all characters, rule characteristics, and a minimum
length listed in the requirement are supported, and justify the
subset of those characters chosen for testing.
6.1.4.2 FIA_UIA_EXT.1 User Identification and Authentication
FIA_UIA_EXT.1.1 The TSF shall allow the following actions prior to requiring the non‐TOE
entity to initiate the identification and authentication process:
 Display the warning banner in accordance with FTA_TAB.1;
 ICMP replies
FIA_UIA_EXT.1.2 The TSF shall require each administrative user to be successfully identified
and authenticated before allowing any other TSF‐mediated actions on
behalf of that administrative user.
PP Application Note: This requirement applies to users (administrators and external IT entities) of
services available from the TOE directly, and not services available by
connecting through the TOE. While it should be the case that few or no
services are available to external entities prior to identification and
authentication, if there are some available (perhaps ICMP echo) these
should be listed in the assignment statement; otherwise “no other actions”
should be selected.
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Authentication can be password‐based through the local console or through
a protocol that supports passwords (such as SSH), or be certificate based
(SSH, TLS).
For communications with external IT entities (e.g., an audit server or NTP
server, for instance), such connections must be performed in accordance
with FTP_ITC.1, whose protocols perform identification and authentication.
This means that such communications (e.g., establishing the IPsec
connection to the authentication server) would not have to be specified in
the assignment, since establishing the connection “counts” as initiating the
identification and authentication process.
Assurance Activity: The evaluator shall examine the TSS to determine that it describes the logon
process for each logon method (local, remote (HTTPS, SSH, etc.)) supported
for the product. This description shall contain information pertaining to the
credentials allowed/used, any protocol transactions that take place, and
what constitutes a “successful logon”. The evaluator shall examine the
operational guidance to determine that any necessary preparatory steps
(e.g., establishing credential material such as pre‐shared keys, tunnels,
certificates, etc.) to logging in are described. For each supported the login
method, the evaluator shall ensure the operational guidance provides clear
instructions for successfully logging on. If configuration is necessary to
ensure the services provided before login are limited, the evaluator shall
determine that the operational guidance provides sufficient instruction on
limiting the allowed services.
The evaluator shall perform the following tests for each method by which
administrators access the TOE (local and remote), as well as for each type of
credential supported by the login method:
1. Test 1: The evaluator shall use the operational guidance to
configure the appropriate credential supported for the login
method. For that credential/login method, the evaluator shall show
that providing correct I&A information results in the ability to access
the system, while providing incorrect information results in denial
of access.
2. Test 2: The evaluator shall configure the services allowed (if any)
according to the operational guidance, and then determine the
services available to an external remote entity. The evaluator shall
determine that the list of services available is limited to those
specified in the requirement.
3. Test 3: For local access, the evaluator shall determine what services
are available to a local administrator prior to logging in, and make
sure this list is consistent with the requirement.
6.1.4.3 FIA_UAU_EXT.2 Password‐based Authentication Mechanism
FIA_UAU_EXT.2.1 The TSF shall provide a local password‐based authentication mechanism,
none, to perform administrative user authentication.
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Assurance Activity: Assurance activities for this requirement are covered under those for
FIA_UIA_EXT.1. If other authentication mechanisms are specified, the
evaluator shall include those methods in the activities for FIA_UIA_EXT.1.
6.1.4.4 FIA_UAU.7 Protected Authentication Feedback
FIA_UAU.7.1 The TSF shall provide only obscured feedback to the administrative user
while the authentication is in progress at the local console.
PP Application Note: “Obscured feedback” implies the TSF does not produce a visible display of
any authentication data entered by a user (such as the echoing of a
password), although an obscured indication of progress may be provided
(such as an asterisk for each character). It also implies that the TSF does not
return any information during the authentication process to the user that
may provide any indication of the authentication data.
Assurance Activity: The evaluator shall perform the following test for each method of local login
allowed:
1. Test 1: The evaluator shall locally authenticate to the TOE. While
making this attempt, the evaluator shall verify that at most,
obscured feedback is provided while entering the authentication
information.
6.1.5 Security Management (FMT)
6.1.5.1 FMT_MTD.1 Management of TSF Data (for general TSF data)
FMT_MTD.1.1 The TSF shall restrict the ability to manage the TSF data to the Security
Administrators.
PP Application Note: The word “manage” includes but is not limited to create, initialize, view,
change default, modify, delete, clear, and append. This requirement is
intended to be the “default” requirement for management of TSF data;
other iterations of FMT_MTD should place different restrictions or
operations available on the specifically‐identified TSF data. TSF data includes
cryptographic information as well; managing these data would include the
association of a cryptographic protocol with an interface, for instance.
Assurance Activity: The evaluator shall review the operational guidance to determine that each
of the TSF‐data‐manipulating functions implemented in response to the
requirements of the NDPP is identified, and that configuration information
is provided to ensure that only administrators have access to the functions.
The evaluator shall examine the TSS to determine that, for each
administrative function identified in the operational guidance; those that
are accessible through an interface prior to administrator log‐in are
identified. For each of these functions, the evaluator shall also confirm that
the TSS details how the ability to manipulate the TSF data through these
interfaces is disallowed for non‐administrative users.
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6.1.5.2 FMT_SMF.1 Specification of Management Functions
FMT_SMF.1.1 The TSF shall be capable of performing the following management
functions:
1. Ability to administer the TOE locally and remotely;
2. Ability to update the TOE, and to verify the updates using published
hash capability prior to installing those updates;
3. Ability to configure the cryptographic functionality;
PP Application Note: The TOE must provide functionality for both local and remote
administration, as well as the capability for the administrator to verify that
updates received came from a trusted source. They must be capable of
performing this action using digital signatures, and optionally a published
hash. The ST author chooses whether the published hash verification option
is available using the first selection, which must match the corresponding
selection in FPT_TUD_EXT.1.3. If the TOE offers the ability for the
administrator to configure the services available prior to identification or
authentication, or if any of the cryptographic functionality on the TOE can be
configured, then the ST author makes the appropriate choice or choices in
the second selection, otherwise select "no other capabilities."
Assurance Activity: The security management functions for FMT_SMF.1 are distributed
throughout the PP and are included as part of the requirements in
FMT_MTD, FPT_TST_EXT, and any cryptographic management functions
specified in the reference standards. Compliance to these requirements
satisfies compliance with FMT_SMF.1.
6.1.5.3 FMT_SMR.2 Restrictions on Security Roles
FMT_SMR.2.1 The TSF shall maintain the roles:
1. Authorized Administrator.
FMT_SMR.2.2 The TSF shall be able to associate users with roles.
FMT_SMR.2.3 The TSF shall ensure that the conditions
1. Authorized Administrator role shall be able to administer the TOE
locally;
2. Authorized Administrator role shall be able to administer the TOE
remotely;
are satisfied.
PP Application Note: FMT_SMR.2.2 requires that user accounts be associated with only one role.
However, note that multiple users may have the same role, and the TOE is
not required to restrict roles to a single person.
FMT_SMR.2.3 requires that an authorized administrator be able to
administer the TOE through the local console and through a remote
mechanism (IPsec, SSH, TLS, TLS/HTTPS). For multiple component TOEs, only
the TOE components providing the management control and configuration
of the other TOE components require a local administration interface.
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Assurance Activity: The evaluator shall review the operational guidance to ensure that it
contains instructions for administering the TOE both locally and remotely,
including any configuration that needs to be performed on the client for
remote administration. In the course of performing the testing activities for
the evaluation, the evaluator shall use all supported interfaces, although it
is not necessary to repeat each test involving an administrative action with
each interface. The evaluator shall ensure, however, that each supported
method of administering the TOE that conforms to the requirements of the
NDPP be tested; for instance, if the TOE can be administered through a local
hardware interface; SSH; and TLS/HTTPS; then all three methods of
administration must be exercised during the evaluation team’s test
activities.
6.1.6 Protection of the TSF (FPT)
6.1.6.1 FPT_SKP_EXT.1 Protection of TSF Data (for reading of all symmetric keys)
FPT_SKP_EXT.1.1 The TSF shall prevent reading of all pre‐shared keys, symmetric keys, and
private keys.
PP Application Note: The intent of the requirement is that an administrator is unable to read or
view the identified keys (stored or ephemeral) through “normal” interfaces.
While it is understood that the administrator could directly read memory to
view these keys, do so is not a trivial task and may require substantial work
on the part of an administrator. Since the administrator is considered a
trusted agent, it is assumed they would not endeavor in such an activity.
Assurance Activity: The evaluator shall examine the TSS to determine that it details how any
pre‐shared keys, symmetric keys, and private keys are stored and that they
are unable to be viewed through an interface designed specifically for that
purpose, as outlined in the application note. If these values are not stored in
plaintext, the TSS shall describe how they are protected/obscured.
6.1.6.2 FPT_APW_EXT.1 Protection of Administrator Passwords
FPT_APW_EXT.1.1 The TSF shall store passwords in non‐plaintext form.
FPT_APW_EXT.1.2 The TSF shall prevent the reading of plaintext passwords.
PP Application Note: The intent of the requirement is that raw password authentication data are
not stored in the clear, and that no user or administrator is able to read the
plaintext password through “normal” interfaces. An all‐powerful
administrator of course could directly read memory to capture a password
but is trusted not to do so.
In this version of the PP there are no requirements on the method used to
store the passwords in non‐plaintext form, but cryptographic methods based
on the requirements in FCS_COP are preferred. In future versions of the
NDPP, FCS_COP‐based cryptographic methods that conform to the Level 2
Credential Storage requirements from NIST SP 800‐63 will be required.
Assurance Activity: The evaluator shall examine the TSS to determine that it details all
authentication data that are subject to this requirement, and the method
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used to obscure the plaintext password data when stored. The TSS shall also
detail passwords are stored in such a way that they are unable to be viewed
through an interface designed specifically for that purpose, as outlined in
the application note.
6.1.6.3 FPT_STM.1 Reliable Time Stamps
FPT_STM.1.1 The TSF shall be able to provide reliable time stamps for its own use.
Assurance Activity: The evaluator shall examine the TSS to ensure that it lists each security
function that makes use of time. The TSS provides a description of how the
time is maintained and considered reliable in the context of each of the
time related functions.
The evaluator examines the operational guidance to ensure it instructs the
administrator how to set the time. If the TOE supports the use of an NTP
server, the operational guidance instructs how a communication path is
established between the TOE and the NTP server, and any configuration of
the NTP client on the TOE to support this communication.
1. Test 1: The evaluator uses the operational guide to set the time. The
evaluator shall then use an available interface to observe that the
time was set correctly.
2. Test2: [conditional] If the TOE supports the use of an NTP server;
the evaluator shall use the operational guidance to configure the
NTP client on the TOE, and set up a communication path with the
NTP server. The evaluator will observe that the NTP server has set
the time to what is expected. If the TOE supports multiple protocols
for establishing a connection with the NTP server, the evaluator
shall perform this test using each supported protocol claimed in the
operational guidance.
6.1.6.4 FPT_TUD_EXT.1 Trusted Update
FPT_TUD_EXT.1.1 The TSF shall provide security administrators the ability to query the current
version of the TOE firmware/software.
FPT_TUD_EXT.1.2 The TSF shall provide security administrators the ability to initiate updates
to TOE firmware/software.
FPT_TUD_EXT.1.3 The TSF shall provide a means to verify firmware/software updates to the
TOE using a published hash prior to installing those updates.
PP Application Note: The digital signature mechanism referenced in the third element is the one
specified in FCS_COP.1(2). The published hash referenced is generated by
one of the functions specified in FCS_COP.1(3). The ST author should choose
the mechanism implemented by the TOE; it is acceptable to implement both
mechanisms.
Assurance Activity: Updates to the TOE either have a hash associated with them, or are signed
by an authorized source. If digital signatures are used, the definition of an
authorized source is contained in the TSS, along with a description of how
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the certificates used by the update verification mechanism are contained on
the device. The evaluator ensures this information is contained in the TSS.
The evaluator also ensures that the TSS (or the operational guidance)
describes how the candidate updates are obtained; the processing
associated with verifying the digital signature or calculating the hash of the
updates; and the actions that take place for successful (hash or signature
was verified) and unsuccessful (hash or signature could not be verified)
cases. The evaluator shall perform the following tests:
1. Test 1: The evaluator performs the version verification activity to
determine the current version of the product. The evaluator obtains
a legitimate update using procedures described in the operational
guidance and verifies that it is successfully installed on the TOE.
Then, the evaluator performs a subset of other assurance activity
tests to demonstrate that the update functions as expected. After
the update, the evaluator performs the version verification activity
again to verify the version correctly corresponds to that of the
update.
2. Test 2: The evaluator performs the version verification activity to
determine the current version of the product. The evaluator obtains
or produces an illegitimate update, and attempts to install it on the
TOE. The evaluator verifies that the TOE rejects the update.
6.1.6.5 FPT_TST_EXT.1 TSF Testing
FPT_TST_EXT.1.1 The TSF shall run a suite of self tests during initial start‐up (on power on) to
demonstrate the correct operation of the TSF.
Assurance Activity: The evaluator shall examine the TSS to ensure that it details the self tests
that are run by the TSF on start‐up; this description should include an
outline of what the tests are actually doing (e.g., rather than saying
"memory is tested", a description similar to "memory is tested by writing a
value to each memory location and reading it back to ensure it is identical to
what was written" shall be used). The evaluator shall ensure that the TSS
makes an argument that the tests are sufficient to demonstrate that the TSF
is operating correctly.
The evaluator shall also ensure that the operational guidance describes the
possible errors that may result from such tests, and actions the
administrator should take in response; these possible errors shall
correspond to those described in the TSS.
6.1.7 TOE Access (FTA)
6.1.7.1 FTA_SSL_EXT.1 TSF‐initiated Session Locking
FTA_SSL_EXT.1.1 The TSF shall, for local interactive sessions,
a) terminate the session
after a Security Administrator‐specified time period of inactivity.
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Assurance Activity: The evaluator shall perform the following test:
1. Test 1: The evaluator follows the operational guidance to configure
several different values for the inactivity time period referenced in
the component. For each period configured, the evaluator
establishes a local interactive session with the TOE. The evaluator
then observes that the session is either locked or terminated after
the configured time period. If locking was selected from the
component, the evaluator then ensures that re‐authentication is
needed when trying to unlock the session.
6.1.7.2 FTA_SSL.3 TSF‐initiated Termination
FTA_SSL.3.1 The TSF shall terminate a remote interactive session after a Security
Administrator‐configurable time interval of session inactivity.
Assurance Activity: The evaluator shall perform the following test:
1. Test 1: The evaluator follows the operational guidance to configure
several different values for the inactivity time period referenced in
the component. For each period configured, the evaluator
establishes a remote interactive session with the TOE. The evaluator
then observes that the session is terminated after the configured
time period.
6.1.7.3 FTA_SSL.4 User‐initiated Termination
FTA_SSL.4.1 The TSF shall allow Administrator‐initiated termination of the
Administrator’s own interactive session.
Assurance Activity: The evaluator shall perform the following test:
1. Test 1: The evaluator initiates an interactive local session with the
TOE. The evaluator then follows the operational guidance to exit or
log off the session and observes that the session has been
terminated.
2. Test 2: The evaluator initiates an interactive remote session with
the TOE. The evaluator then follows the operational guidance to exit
or log off the session and observes that the session has been
terminated.
6.1.7.4 FTA_TAB.1 Default TOE Access Banners
FTA_TAB.1.1 Before establishing an administrative user session the TSF shall display a
Security Administrator‐specified advisory notice and consent warning
message regarding use of the TOE.
PP Application Note: This requirement is intended to apply to interactive sessions between a
human user and a TOE. IT entities establishing connections or programmatic
connections (e.g., remote procedure calls over a network) are not required
to be covered by this requirement.
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Assurance Activity: The evaluator shall check the TSS to ensure that it details each method of
access (local and remote) available to the administrator (e.g., serial port,
SSH, HTTPS). The evaluator shall also perform the following test:
1. Test 1: The evaluator follows the operational guidance to configure
a notice and consent warning message. The evaluator shall then, for
each method of access specified in the TSS, establish a session with
the TOE. The evaluator shall verify that the notice and consent
warning message is displayed in each instance.
6.1.8 Trusted Path/Channels (FTP)
6.1.8.1 FTP_ITC.1 Inter‐TSF‐trusted channel
FTP_ITC.1.1 The TSF shall use SSH and no other protocols to provide a trusted
communication channel between itself and authorized IT entities supporting
the following capabilities: audit server, that is logically distinct from other
communication channels and provides assured identification of its end
points and protection of the channel data from disclosure and detection of
modification of the channel data.
FTP_ITC.1.2 The TSF shall permit the TSF, or the authorized IT entities to initiate
communication via the trusted channel.
FTP_ ITC.1.3 The TSF shall initiate communication via the trusted channel for syslog.
PP Application Note: The intent of the above requirement is to use a cryptographic protocol to
protect external communications with authorized IT entities that the TOE
interacts with to perform its functions. This is not, however, to be used to
specify VPN Gateway functionality; a separate VPN Protection Profile should
be used in these instances. Protection (by either (or both) of the IPsec or SSH
protocols) is required at least for communications with the server that
collects the audit information. If it communicates with an authentication
server (e.g., RADIUS), then the ST author chooses “authentication server” in
FTP_ITC.1.1 and this connection must be protected by either IPsec or SSH. If
other authorized IT entities (e.g., NTP server) are protected, the ST author
makes the appropriate assignments (for those entities) and selections (for
the protocols that are used to protect those connections). After the ST
author has made the selections, they are to select the detailed requirements
in Annex C corresponding to their protocol selection to put in the ST. TLS or
HTTPS can only be used if tunneled through IPsec or SSH. To summarize, the
connection to an external audit collection server is required to be protected
by either IPsec or SSH protocols. If an external authentication server is
supported, then it is required to protect that connection with either IPsec or
SSH. For any other external server, external communications are not
required to be protected, but if protection is claimed, then it must be
protected with either IPsec or SSH.
While there are no requirements on the party initiating the communication,
the ST author lists in the assignment for FTP_ITC.1.3 the services for which
the TOE can initiate the communication with the authorized IT entity.
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The requirement implies that not only are communications protected when
they are initially established, but also on resumption after an outage. It may
be the case that some part of the TOE setup involves manually setting up
tunnels to protect other communication, and if after an outage the TOE
attempts to re‐establish the communication automatically with (the
necessary) manual intervention, there may be a window created where an
attacker might be able to gain critical information or compromise a
connection.
Assurance Activity: The evaluator shall examine the TSS to determine that, for all
communications with authorized IT entities identified in the requirement,
each communications mechanism is identified in terms of the allowed
protocols for that IT entity. The evaluator shall also confirm that all
protocols listed in the TSS are specified and included in the requirements in
the ST. The evaluator shall confirm that the operational guidance contains
instructions for establishing the allowed protocols with each authorized IT
entity, and that it contains recovery instructions should a connection be
unintentionally broken. The evaluator shall also perform the following tests:
1. Test 1: The evaluators shall ensure that communications using each
protocol with each authorized IT entity is tested during the course
of the evaluation, setting up the connections as described in the
operational guidance and ensuring that communication is
successful.
2. Test 2: For each protocol that the TOE can initiate as defined in the
requirement, the evaluator shall follow the operational guidance to
ensure that in fact the communication channel can be initiated from
the TOE.
3. Test 3: The evaluator shall ensure, for each communication channel
with an authorized IT entity, the channel data are not sent in
plaintext.
4. Test 4: The evaluators shall, for each protocol associated with each
authorized IT entity tested during test 1, the connection is physically
interrupted. The evaluator shall ensure that when physical
connectivity is restored, communications are appropriately
protected.
Further assurance activities are associated with the specific protocols.
6.1.8.2 FTP_TRP.1 Trusted Path
FTP_TRP.1.1 The TSF shall use SSH and no other products to provide a trusted
communication path between itself and remote administrators that is
logically distinct from other communication paths and provides assured
identification of its end points and protection of the communicated data
from disclosure and detection of modification of the communicated data.
FTP_TRP.1.2 The TSF shall permit remote administrators to initiate communication via
the trusted path.
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FTP_TRP.1.3 The TSF shall require the use of the trusted path for initial administrator
authentication and all remote administration actions.
PP Application Note: This requirement ensures that authorized remote administrators initiate all
communication with the TOE via a trusted path, and that all
communications with the TOE by remote administrators is performed over
this path. The data passed in this trusted communication channel are
encrypted as defined the protocol chosen in the first selection. The ST author
chooses the mechanism or mechanisms supported by the TOE, and then
ensures the detailed requirements in Annex C corresponding to their
selection are copied to the ST if not already present.
Assurance Activity: The evaluator shall examine the TSS to determine that the methods of
remote TOE administration are indicated, along with how those
communications are protected. The trusted path is required to be
implemented with either IPsec or SSH; TLS/HTTPS is only allowed if tunneled
through one of the other two protocols. The evaluator shall also confirm
that all protocols listed in the TSS in support of TOE administration are
consistent with those specified in the requirement, and are included in the
requirements in the ST. The evaluator shall confirm that the operational
guidance contains instructions for establishing the remote administrative
sessions for each supported method. The evaluator shall also perform the
following tests:
1. Test 1: The evaluators shall ensure that communications using each
specified (in the operational guidance) remote administration
method is tested during the course of the evaluation, setting up the
connections as described in the operational guidance and ensuring
that communication is successful.
2. Test 2: For each method of remote administration supported, the
evaluator shall follow the operational guidance to ensure that there
is no available interface that can be used by a remote user to
establish a remote administrative sessions without invoking the
trusted path.
3. Test 3: The evaluator shall ensure, for each method of remote
administration, the channel data are not sent in plaintext.
Further assurance activities are associated with the specific protocols.
6.2 Security Assurance Requirements
This Security Target is conformant with the assurance requirements specified in the NDPP. The CC Part 3
conformant security assurance requirements are listed in Table 11. The CC Part 3 extended assurance
requirements are listed in Section 6.1 as “Assurance Activity” and Section 6.2.1.
Table 11: Assurance Requirements
Assurance Class Assurance
Component
Assurance Components Description
Development ADV_FSP.1 Basic functional specification
Guidance
Documents
AGD_OPE.1 Operational user guidance
AGD_PRE.1 Preparative user guidance
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Life‐cycle Support ALC_CMC.1 Labeling of the TOE
ALC_CMS.1 TOE CM coverage
Tests ATE_IND.1 Independent testing ‐ conformance
Vulnerability
Assessment
AVA_VAN.1 Vulnerability analysis
6.2.1 Extended Security Assurance Requirements
These requirements are taken directly from the NDPP and augment or modify the existing SARs taken
from CC Part 3.
6.2.1.1 ADV_FSP.1
There are no specific assurance activities associated with these SARs. The functional specification
documentation is provided to support the evaluation activities described in Section 6.1, and other
activities described for AGD, ATE, and AVA SARs. The requirements on the content of the functional
specification information is implicitly assessed by virtue of the other assurance activities being
performed; if the evaluator is unable to perform an activity because the there is insufficient interface
information, then an adequate functional specification has not been provided.
6.2.1.2 AGD_OPE.1
Some of the contents of the operational guidance will be verified by the assurance activities in Section
6.1 and evaluation of the TOE according to the CEM. The following additional information is also
required.
The operational guidance shall at a minimum list the processes running (or that could run) on the TOE in
its evaluated configuration during its operation that are capable of processing data received on the
network interfaces (there are likely more than one of these, and this is not limited to the process that
"listens" on the network interface). It is acceptable to list all processes running (or that could run) on the
TOE in its evaluated configuration instead of attempting to determine just those that process the
network data. For each process listed, the administrative guidance will contain a short (e.g., one‐ or two‐
line) description of the process' function, and the privilege with which the service runs. "Privilege"
includes the hardware privilege level (e.g., ring 0, ring 1), any software privileges specifically associated
with the process, and the privileges associated with the user role the process runs as or under.
The operational guidance shall contain instructions for configuring the cryptographic engine associated
with the evaluated configuration of the TOE. It shall provide a warning to the administrator that use of
other cryptographic engines was not evaluated nor tested during the CC evaluation of the TOE.
The documentation must describe the process for verifying updates to the TOE, either by checking the
hash or by verifying a digital signature. The evaluator shall verify that this process includes the following
steps:
1. For hashes, a description of where the hash for a given update can be obtained. For digital
signatures, instructions for obtaining the certificate that will be used by the FCS_COP.1(2)
mechanism to ensure that a signed update has been received from the certificate owner. This
may be supplied with the product initially, or may be obtained by some other means.
2. Instructions for obtaining the update itself. This should include instructions for making the
update accessible to the TOE (e.g., placement in a specific directory).
3. Instructions for initiating the update process, as well as discerning whether the process was
successful or unsuccessful. This includes generation of the hash/digital signature.
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The TOE will likely contain security functionality that does not fall in the scope of evaluation under the
NDPP. The operational guidance shall make it clear to an administrator which security functionality is
covered by the evaluation activities.
6.2.1.3 AGD_PRE.1
As indicated in the introduction above, there are significant expectations with respect to the
documentation, especially when configuring the operational environment to support TOE functional
requirements. The evaluator shall check to ensure that the guidance provided for the TOE adequately
addresses all platforms claimed for the TOE in the ST.
6.2.1.4 ATE_IND.1
The evaluator shall prepare a test plan and report documenting the testing aspects of the system. The
test plan covers all of the testing actions contained in the CEM and the body of this PP’s Assurance
Activities. While it is not necessary to have one test case per test listed in an Assurance Activity, the
evaluator must document in the test plan that each applicable testing requirement in the ST is covered.
The test plan identifies the platforms to be tested, and for those platforms not included in the test plan
but included in the ST, the test plan provides a justification for not testing the platforms. This
justification must address the differences between the tested platforms and the untested platforms, and
make an argument that the differences do not affect the testing to be performed. It is not sufficient to
merely assert that the differences have no affect; rationale must be provided. If all platforms claimed in
the ST are tested, then no rationale is necessary.
The test plan describes the composition of each platform to be tested, and any setup that is necessary
beyond what is contained in the AGD documentation. It should be noted that the evaluator is expected
to follow the AGD documentation for installation and setup of each platform either as part of a test or as
a standard pre‐test condition. This may include special test drivers or tools. For each driver or tool, an
argument (not just an assertion) should be provided that the driver or tool will not adversely affect the
performance of the functionality by the TOE and its platform. This also includes the configuration of the
cryptographic engine to be used. The cryptographic algorithms implemented by this engine are those
specified by the NDPP and used by the cryptographic protocols being evaluated (IPsec, TLS/HTTPS, SSH).
The test plan identifies high‐level test objectives as well as the test procedures to be followed to achieve
those objectives. These procedures include expected results. The test report (which could just be an
annotated version of the test plan) details the activities that took place when the test procedures were
executed, and includes the actual results of the tests. This shall be a cumulative account, so if there was
a test run that resulted in a failure, a fix installed, and then a successful re‐run of the tests, the report
would show a “fail” and “pass” result (and the supporting details), and not just the “pass” result.
6.2.1.5 AVA_VAN.1
As with ATE_IND, the evaluator shall generate a report to document their findings with respect to this
requirement. This report could physically be part of the overall test report mentioned in ATE_IND, or a
separate document. The evaluator performs a search of public information to determine the
vulnerabilities that have been found in network infrastructure devices and the implemented
communication protocols in general, as well as those that pertain to the particular TOE. The evaluator
documents the sources consulted and the vulnerabilities found in the report. For each vulnerability
found, the evaluator either provides a rationale with respect to its non‐applicability, or the evaluator
formulates a test (using the guidelines provided in ATE_IND) to confirm the vulnerability, if suitable.
Suitability is determined by assessing the attack vector needed to take advantage of the vulnerability.
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For example, if the vulnerability can be detected by pressing a key combination on boot‐up, a test would
be suitable at the assurance level of the NDPP. If exploiting the vulnerability requires expert skills and an
electron microscope, for instance, then a test would not be suitable and an appropriate justification
would be formulated.
6.3 Security Requirements Rationale
6.3.1 Security Function Requirement to Security Objective Rationale
Table 12: SFR to Objective Mapping
Objective
# SFR/SAR
O.PROTECTED_COMMUNICATIONS
O.VERIFIABLE_UPDATES
O.SYSTEM_MONITORING
O.DISPLAY_BANNER
O.TOE_ADMINISTRATION
O.REDIDUAL_INFORMATION_CLEARING
O.SESSION_LOCK
O.TSF_SELF_TEST
1. FAU_GEN.1 X
2. FAU_GEN.2 X
3. FAU_STG_EXT.1 X
4. FCS_CKM.1 X
5. FCS_CKM_EXT.4 X
6. FCS_COP.1(1) X
7. FCS_COP.1(2) X X
8. FCS_COP.1(3) X X
9. FCS_COP.1(4) X
10. FCS_RGB_EXT.1 X
11. FDP_RIP.2 X
12. FIA_PMG_EXT.1 X
13. FIA_UIA_EXT.1 X
14. FIA_UAU_EXT.1
15. FIA_UAU.7 X
16. FMT_MTD.1 X
17. FMT_SMF.1 X
18. FMT_SMR.2 X
19. FPT_APW_EXT.1 X
20. FPT_SKP_EXT.1 X
21. FPT_STM.1 X
22. FPT_TUD_EXT.1 X
23. FPT_TST_EXT.1 X
24. FTA_SSL_EXT.1 X
25. FTA_SSL.3 X
26. FTA_SSL.4
27. FTA_TAB.1 X
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Table 12: SFR to Objective Mapping
Objective
# SFR/SAR
O.PROTECTED_COMMUNICATIONS
O.VERIFIABLE_UPDATES
O.SYSTEM_MONITORING
O.DISPLAY_BANNER
O.TOE_ADMINISTRATION
O.REDIDUAL_INFORMATION_CLEARING
O.SESSION_LOCK
O.TSF_SELF_TEST
28. FTP_ITC.1 X
29. FTP_TRP.1 X
The following sections present the rationales that demonstrate that the SFRs meet all security objectives
for the TOE.
6.3.1.1 Protected Communications
O.PROTECTED_COMMUNICATIONS
To address the issues concerning transmitting sensitive data to and from the TOE described in Section
3.1, Table 5, row “T.UNAUTHORIZED_ACCESS”, compliant TOEs will provide encryption for these
communication paths between themselves and the endpoint. These channels are implemented using
one (or more) of three standard protocols: IPsec, TLS/HTTPS, and SSH. These protocols are specified by
RFCs that offer a variety of implementation choices. Requirements have been imposed on some of these
choices (particularly those for cryptographic primitives) to provide interoperability and resistance to
cryptographic attack. While compliant TOEs must support all of the choices specified in the ST, they may
support additional algorithms and protocols. If such additional mechanisms are not evaluated, guidance
must be given to the administrator to make clear the fact that they are not evaluated.
In addition to providing protection from disclosure (and detection of modification) for the
communications, each of the protocols described in this document (IPsec, SSH, and TLS/HTTPS) offer
two‐way authentication of each endpoint in a cryptographically secure manner, meaning that even if
there was a malicious attacker between the two endpoints, any attempt to represent themselves to
either endpoint of the communications path as the other communicating party would be detected. The
requirements on each protocol, in addition to the structure of the protocols themselves, provide
protection against replay attacks such as those described in Section 3.1, Table 5, row
“T.UNAUTHORIZED_ACCESS”, usually by including a unique value in each communication so that replay
of that communication can be detected.
(FCS_CKM.1, FCS_CKM_EXT.4, FCS_COP.1(1), FCS_COP.1(2), FCS_COP.1(3), FCS_COP.1(4),
FCS_RBG_EXT.1, FPT_SKP_EXT.1, FTP_ITC.1, FTP_TRP.1, FCS_SSH_EXT.1)
6.3.1.2 Verifiable Updates
O.VERIFIABLE_UPDATES
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As outlined in Section 3.1, Table 5, row “T.UNAUTHORIZED_UPDATE”, failure by the Security
Administrator to verify that updates to the system can be trusted may lead to compromise of the entire
system. A first step in establishing trust in the update is to publish a hash of the update that can be
verified by the System Administrator prior to installing the update. In this way, the Security
Administrator can download the update, compute the hash, and compare it to the published hash.
While this establishes that the update downloaded is the one associated with the published hash, it
does not indicate if the source of the update/hash combination has been compromised or can’t be
trusted. So, there remains a threat to the system. To establish trust in the source of the updates, the
system can provide cryptographic mechanisms and procedures to procure the update, check the update
cryptographically through the TOE‐provided digital signature mechanism, and install the update on the
system. While there is no requirement that this process be completely automated, administrative
guidance documentation will detail any procedures that must be performed manually, as well as the
manner in which the administrator ensures that the signature on the update is valid.
(FPT_TUD_EXT.1, FCS_COP.1(2), FCS_COP.1(3))
6.3.1.3 System Monitoring
O.SYSTEM_MONITORING
In order to assure that information exists that allows Security Administrators to discover intentional and
unintentional issues with the configuration and/or operation of the system as discussed in Section 3.1;
Table 5; rows “T.ADMIN_ERROR”, “T_UNDETECTED_ACTIONS”, and “T.UNAUTHROIZED_ACCESS”;
compliant TOEs have the capability of generating audit data targeted at detecting such activity. Auditing
of administrative activities provides information that may hasten corrective action should the system be
configured incorrectly. Audit of select system events can provide an indication of failure of critical
portions of the TOE (e.g., a cryptographic provider process not running) or anomalous activity (e.g.,
establishment of an administrative session at a suspicious time, repeated failures to establish sessions or
authenticate to the system) of a suspicious nature.
In some instances there may be a large amount of audit information produced that could overwhelm
the TOE or administrators in charge of reviewing the audit information. The TOE must be capable of
sending audit information to an external trusted entity, which mitigates the possibility that the
generated audit data will cause some kind of denial of service situation on the TOE. This information
must carry reliable timestamps, which will help order the information when sent to the external device.
Loss of communication with the audit server is problematic. While there are several potential
mitigations to this threat, the NDPP does not mandate that a specific action takes place; the degree to
which this action preserves the audit information and still allows the TOE to meet its functionality
responsibilities should drive decisions on the suitability of the TOE in a particular environment.
(FAU_GEN.1, FAU_GEN.2, FAU_STG_EXT.1, FPT_STM.1)
6.3.1.4 TOE Administration
O.TOE_ADMINISTRATION, O.SESSION_LOCK
In order to provide a trusted means for administrators to interact with the TOE, the TOE provides a
password‐based logon mechanism. The administrator must have the capability to compose a strong
password, and have mechanisms in place so that the password must be changed regularly. To avoid
attacks where an attacker might observe a password being typed by an administrator, passwords must
be obscured during logon. Session locking or termination must also be implemented to mitigate the risk
of an account being used illegitimately. Passwords must be stored in an obscured form, and there must
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be no interface provided for specifically reading the password or password file such that the passwords
are displayed in plain text.
(FIA_UIA_EXT.1, FIA_PMG_EXT.1, FIA_UAU.7, FMT_MTD.1, FMT_SMF.1, FMT_SFR.1, FPT_APW_EXT.1,
FTA_SSL_EXT.1, FTA_SSL.3)
O.DISPLAY_BANNER
(FTA_TAB.1)
6.3.1.5 Residual Information Clearing
O.RESIDUAL_INFORMATION_CLEARING
In order to counter the threat that user data is inadvertently included in network traffic not intended by
the original sender, the TSF ensures that network packets sent from the TOE do not include data "left
over" from the processing of previous network information.
(FDP_RIP.2)
6.3.1.6 TSF Self Test
O.TSF_SELF_TEST
In order to detect some number of failures of underlying security mechanisms used by the TSF, the TSF
will perform self tests. The extent of this self testing is left to the product developer, but a more
comprehensive set of self‐tests should result in a more trustworthy platform on which to develop
enterprise architecture.
(FPT_TST_EXT.1)
6.3.2 Security Functional Requirement Dependency Rationale
As discussed in Section 2, Conformance Claims, this PP claims strict conformance to the NDPP from
which all SFRs are used. Therefore, all dependencies are filled.
6.3.3 Security Assurance Requirements Rationale
As discussed in Section 2, Conformance Claims, this PP claims strict conformance to the NDPP from
which all SARs are used. Therefore, all dependencies are filled.
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7 TOE Summary Specification
This section provides evaluators and potential consumers of the TOE with a high‐level description of
each SFR, thereby enabling them to gain a general understanding of how the TOE is implemented. These
descriptions are intentionally not overly detailed, thereby disclosing no proprietary information. These
sections refer to SFRs defined in Section 6, Security Requirements.
The TOE consists of the following Security Functions:
 Security Audit
 Cryptographic Operations
 User Data Protection
 Security Management
 Extended Requirements
 Protection of the TSF
 TOE Access
 Trusted Path/Channels
7.1 Security Audit
7.1.1 Audit Generation
When an individual system process creates an audit message, it will include the outcome of the event in
the generated message. When the AAA module or CLI generates an audit message, it will add the
subject identity, i.e. username, to the message whenever possible. Each possible audit event generated
by the TOE is defined in Table 9. The syslog process formats and adds extra audit information including
the time, date, system process, severity, and type of event to the audit event.
The table below contains the list of protocol failures that are auditable.
Table 13: Auditable Protocol Failures
Protocol Auditable Failures
SSH Communication failure
 Received disconnect
 Connection closed
(FTP_TRP.1) Failure of the trusted path functions
 Corrupted MAC on input
(FCS_SSH_EXT.1) Failure to establish an SSH session
 Unable to negotiate a key exchange method
 Initial connection refused by the remote host
 Session terminated with no password
 Invalid credentials provided
o Password
o Public/private key pair
7.1.2 Audit Storage
Audit data is stored locally in volatile memory (DRAM). Using the Linux EOS, a separate 411MB RAM disk
(tmpfs partition) is created at boot time and assigned to the /var directory as part of the global file
system. Logs are stored underneath the subdirectory /var/log, where they are protected from
unauthorized viewing by the filesystem role‐based access control. The restrictive CLI also controls access
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to the commands which allow viewing of these logs. A logrotate daemon is used to manage log size. The
logrotate daemon allows system and EOS log files to grow to 10M in size. Once the logs have reached
their configured capacity, they are compressed using gunzip compression provided by the Linux EOS.
After four separate compressed files have been created for each log, the oldest compressed file is
deleted to make room for the newest compressed file. When the device is rebooted all log files are
deleted automatically because the volatile memory is cleared.
The TOE establishes a trusted channel between itself and the external audit server. A trusted channel is
created when the TOE establishes an SSH session between itself and the external audit server with TCP
port forwarding enabled. After the SSH session is established, the TOE is configured by the user to
forward all messages received by the syslog process to the listening TCP port created by the SSH
connection. This ensures that all audit traffic is encapsulated and hence protected by the SSH
connection. The TOE, in the default configuration, uses the following CAVP certified algorithms for the
SSH connection: RSA‐2048 for public‐key authentication, AES‐128/256 CBC for data encryption, HMAC‐
SHA1 for data integrity. The CLI command available to the user to initialize the SSH session acts as a
wrapper around the SSH executable and specifies the necessary options for these secure cryptographic
algorithms to the underlying SSH executable. The SSH options and implementation together provide a
trusted channel that protects against audit data disclosure and modification.
7.2 Cryptographic Operations
7.2.1 SSH
The TOE uses OpenSSL 1.0.0e‐fips build for cryptographic operations and OpenSSH 5.5p1 which runs the
SSH service. OpenSSH supports asymmetric key authentication as well as password‐based
authentication for administrators. In the default configuration, OpenSSH is configured to support the
following algorithms:
 RSA‐2048 for public‐key authentication
 AES‐128/256 CBC for data encryption2
 HMAC‐SHA1 for data integrity
 diffie‐hellman‐group14‐sha1 for key exchange
The use of DH group 14 is enforced through the sshd_config configuration file for the SSH daemon and is
not hard‐coded.
In order to comply with RFC 4253 OpenSSH calculates the packet length of all received packets and
simply discards packets larger than 256kb.
7.2.2 RFC Compliance
The TOE uses the SSH client and server provided by the OpenSSH implementation. Members from the
OpenSSH development community participated in the definition of the RFCs and the OpenSSH
organization claims to have implemented the RFCs on this website:
http://www.openssh.org/specs.html. Per RFC 2119 “Key words for use in RFCs to Indicate Requirement
Levels”, to claim that one implements an RFC, one must implement all MUST, REQUIRED, and SHALLs in
the specification. Furthermore, one must not implement any MUST NOT and SHALL NOT. Arista's
2
Although the product uses AES‐128/256, the security strength of the connections it forms are only 112
bits, (diffie‐hellman‐group14‐sha1).
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internal investigation has looked at the MUST, MUST NOT, SHALL, SHALL NOT, REQUIRED, MAY,
SHOULD, SHOULD NOT, RECOMMENDED, and NOT RECOMMENDED as specified in RFCs 4251, 4252,
4253, and 4254 and determined that OpenSSH has followed the RFCs and Arista did not find any
exceptions other than those documented by the OpenSSH community. This document is included in
Annex A of the ST.
7.2.3 NIST 800‐56A/B Compliance
The TOE complies with both the 800‐56A and 800‐56B standards. Arista has done extensive code review,
online research, and correspondence with the OpenSSL Development Team. The table below details the
sections of 800‐56A/B that the TOE complies to.
Table 14: NIST 800‐56A/B Compliance
Section Implementation Notes
800‐56A
 1‐5.5.1.1
 5.5.2‐5.6.1.1
 5.6.2‐5.6.2.4
 5.6.3‐5.7.1.1
 7‐9
 5.7.2 is not supported due to MQV having patent issues and
OpenSSH/OpenSSL choosing not to support it for that reason.
 5.8 and 6 are not supported due to the 800‐56A standard being created
after the SSH standard was finalized. However, per 800‐135rev1 the SSH
key‐agreement protocols are permissible.
800‐56B
 1‐5.9
 6‐6.2.2
 6.2.3
 6.3.1
 6.4.2.1 (option 1)
 6.5.1 (section 1‐2)
 6.5.2 (section 6.5.2.2)
 7
 5.9.1‐5.9.2 is not used due to how the SSH protocol structures it's data
 6‐6.2.2 uses PKCS#1 format which uses Chinese Remainder Theorem
option of storage
 6.2.3 ‐ Target security strength of 112 bits is used which requires keys of
bit length 2048.
 6.3.1 ‐ Generated in Chinese Remainder Theorem format
 7 ‐ RSA‐OAEP is used per RFC 4432 for the SSH Protocol
7.2.4 Secret Keys, Private Keys, and CSPs
Sections 7.2.4.1,7.2.4.3, and 7.2.4.3 contain descriptions of all secret keys, private keys, and CSPs used
to generate keys.
7.2.4.1 Private SSH Key
The RSA‐2048 private key used for SSH user authentication is stored in persistent flash memory until no
longer required. It is generated by the device using the OpenSSL cryptographic library discussed below.
When the key is no longer required, the administrator uses the CLI to replace the key. The CLI uses a
secure erase tool in the background, which zeroizes the file by overwriting it with random data once
before it generates a new key.
7.2.4.2 Passwords
The TOE stores the SHA‐512 hash of passwords used for the following accounts: boot loader
administrator, AAA users, and local administrator (root) account.
7.2.4.3 SSH and 800‐90A CSPs
Each CSP used by OpenSSH is managed internally by the OpenSSL cryptographic library. They are listed
in the table below. Each CSP name is generic, corresponding to API parameter data structures.
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Table 15: OpenSSL Cryptographic CSPs and IVs
CSP Name Description Storage
RSA SGK RSA (2048 bits) signature generation key Volatile memory (RAM)
RSA KDK RSA (2048 bits) key decryption (private key transport) key Volatile memory (RAM)
AES EDK AES (128/256) encrypt / decrypt key Volatile memory (RAM)
AES CMAC AES (128/256) CMAC generate / verify key Volatile memory (RAM)
HMAC Key Keyed hash key (160) Volatile memory (RAM)
DH Private DH (Diffie‐Hellman) private agreement key Volatile memory (RAM)
RNG CSPs Seed (128 bit), AES 128/256 seed key and associated state
variables for ANS X9.31 AES based RNG. Used to generate
keys listed above and the SSH private key.
Volatile memory (RAM)
Each respective CSP internal to OpenSSL is zeroized when the process call exits. This is accomplished
using an assembly routine that writes a single pass of zeros to the RAM memory addresses. In the case
of OpenSSH, the process call exits when the SSH connection is closed and the service exits.
Each CSP is protected from unauthorized access through the operating system memory management
that disallows any memory read requests from other processes. The keys are accessible only though the
calling application, which can invoke API functions to export or create keys. Additionally, the API
functions must, by design, be called in non‐overlapping sequence to prevent API calls from executing
concurrently and corrupting CSP values.
7.3 User Data Protection
When a packet of user data is received by a TOE line card, the hardware initially stores the data exactly
as received in line card memory. The TOE is able to determine the exact length (in octets) of each packet
received due to the IEEE 802.3 specification that enforces preambles, interframe gaps, and Maximum
Transmission Unit (MTU) values. As a packet is received by the TOE, memory segments are allocated
from a global memory buffer. The packet is split and stored in these memory segments along with the
count of the number of valid bytes in the segment and pointers to the head segment and next segment.
The entire Ethernet packet is stored as a linked list of memory segment pointers, which allows the TOE
to be aware of the exact byte length. When packets are read from memory, the number of valid bytes in
the packet is used by the TOE to ensure that only valid packet data is read from memory and no data is
reused.
If the packet is destined for a port on the same line card, then the packet is forwarded internally and the
memory is de‐allocated. If the packet is destined for a different line card, the packet is transmitted along
the crossbar switch fabric module and stored on the remote line card. On the Arista 7500E Series
chassis, the packet is divided into variable sized cells (between 64 and 256 bytes) on the source line
card, then forwarded to the destination line card across several available fabric paths in parallel. A
Virtual Output Queuing system is used to coordinate bandwidth requests between the two line cards
and the switch fabric to ensure that packet transmissions do not overlap or get congested along one
path. On the Arista 7300X Series chassis, the packet is stored on the source and destination in the same
way, but transmitted using a different architecture. On the 7300X series line cards flows are transmitted
across a single link that is connected to the destination line card via a hashed CLOS architecture on a
packet forwarding ASIC chip within the fabric module. The packet is only stored within the ASIC, and
uses the same memory structures mentioned above. The Arista 7050X and 7250X Series network
switches use the same packet forwarding ASICs and architecture as the 7300X but are fixed form factor
and use either a single ASIC in the case of the 7050X or multiple ASIC for the 7250X connected in an
internal CLOS architecture.
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When the switch is configured for cut‐through operation, payload errors will lead to bad FCS being set
and the frame discarded by endpoints. In store and forward operation, the packet will be discarded and
nothing will be transmitted. Packet memory is not reused or returned to the free pool until the packet is
fully transmitted.
7.4 Identification and Authentication
The login processes for both local console and remote SSH are the same and are detailed below.
Once a user initiates a connection to the administration interface they are prompted for a username and
password After a user provides authentication credentials, the TOE invokes a PAM (Pluggable
Authentication Modules) AAA plugin. The AAA plugin creates an internal connection to the AAA module
provided by EOS and passes the authentication credentials to the module. The module checks the
credentials against its database and then responds with a SUCCESS or DENIED message. Based on the
response the AAA plugin then returns a SUCCESS or DENIED message. If the requesting program receives
a DENIED message it prints an error message to the user and denies login. If the requesting program
receives a SUCCESS message it allows the user to continue and begin issuing CLI commands. For each CLI
command issued by the administrator, a request is made to the AAA module, which determines if the
user has permission to execute the CLI command.
The TOE also enforces that the user provide a password for access to the boot loader shell, which allows
limited configuration of the EOS image at boot time. A SHA‐512 hash of the boot‐loader password is
stored in the flash memory, which also contains the EOS image. All authorization code is self‐contained
within the boot loader executable.
When RSA authentication is used with a remote SSH session, the SSH daemon performs the initial
authentication verification locally, without going through AAA. Once the RSA key matches, the daemon
still performs CLI authorization requests to the AAA module as detailed above.
7.5 Security Management
Locally stored password information is obscured with SHA‐512 hashing. Traffic between the TOE and all
authorized IT entities is encrypted over an SSHv2 connection using the AES‐128\256‐CBC algorithm.
Although the product uses AES‐128/256, the security strength of the connections it forms are only 112
bits, (diffie‐hellman‐group14‐sha1). Authentication to the IT entity is performed using RSA‐2048
asymmetric keys. The private RSA‐2048 key is stored in plaintext but protected from reading by the
administrative interface that restricts read access of any administrative users. The only method of
bypassing the read protection of the private RSA key is by using the undocumented bash interface as the
root account. Both the interface and the root account are disabled in the CC‐evaluated configuration.
Software updates are verified using SHA‐512 published hash values. Each of these cryptographic
operations are performed by FIPS validated algorithms embedded within OpenSSL (see Cryptographic
Operations).
The TOE does not allow any administrative functions before log‐in.
7.6 Protection of the TSF
7.6.1 Pre‐shared, Symmetric, and Private Key Storage Methods
This section details how pre‐shared, symmetric, and private keys are stored to ensure that they cannot
be read. Table 15 below lists the keys used by the TOE, and the TSF protection for each key.
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Please see section 7.2.4 for further detail of all private keys, secret keys, and CSPs.
Table 16: Key Storage
Key Description Key Type Protection Algorithm Storage
Local Admin Password Pre‐shared SHA‐512 one‐way hash n/a Local file system
AAA Module Users Pre‐shared SHA‐512 one‐way hash n/a Local file system
Boot Loader Password Pre‐shared SHA‐512 one‐way hash n/a Flash storage
Private SSH Key Private Key Plaintext with read control RSA‐2048 Local file system
Read access to all keys is managed through the AAA authentication mechanism and CLI which only
allows authorized administrators the read the appropriate files. The CLI does not provide a documented
command for any administrators to view any private keys. However, the root account (disabled in the
CC‐evaluated configuration) can use the bash prompt and the “cat” tool to circumvent the CLI and read
the private SSH RSA key.
7.6.2 Protection of Administrator Passwords
The TOE uses SHA‐512 hash protection to ensure that any administrator passwords are unable to be
read or stored in plaintext. When a user authenticates locally the system creates a hash of the entered
password and compares it against the stored hash to ensure a plaintext password is never revealed.
7.6.3 Time
Several security functions make use of time, including the audit service rsyslog, SSH timeout during
authentication, and CLI idle‐timeout. Time can be synchronized through either an external NTP server or
using the CLI administrative interface. The CLI only allows authorized administrators to modify the time
or NTP settings.
7.6.4 Updates
Software updates for the TOE have a SHA‐512 hash associated with them. The hash values are stored
and published on the manufacturer’s website that prevents modification. Candidate updates and
published SHA hash values are obtained through the website by the customer. The customer must then
use a trusted application, or the TOE, to calculate the SHA‐512 hash value on the candidate update. The
customer must verify manually that these hash values are identical. If the values are identical the
customer may use the TOE’s administrative interface to install the update. Otherwise the customer must
retry the software update download or contact the manufacturer.
7.6.5 Self‐Tests
The TOE performs a suite of self‐tests during start‐up.
Early in the boot process the TOE performs a memory test which writes two different patterns,
0xffffffffffffffff and 0x5555555555555555, to memory. Between each pass it also reads the memory and
verifies no write errors have occurred. If an error has occurred the TOE marks the memory as
unavailable and logs an error message containing the bad memory addresses.
Later in the boot process cryptographic self‐tests are run which verifies the OpenSSL cryptographic
algorithms are running correctly. The first self‐test checks the software integrity of the library as a whole
by calculating the HMAC‐SHA1 value of the core binaries and comparing it against the value calculated
at compile‐time. All subsequent tests are designed to test each individual cryptographic algorithm
supported by the OpenSSL library. Most algorithm tests provide known inputs to its respective
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cryptographic function, and compares the output of the function to the known correct answer, (stored
at compile time). These tests, called Known Answer Tests, are run for the following cryptographic
algorithms: HMAC‐SHA1, HMAC‐SHA512, AES‐CBC, RSA, X9.31‐RNG.
Combined, this suite of self‐tests help ensure that the TOE is functioning as designed and without fault.
7.7 TOE Access
The table below contains each method of access available to the administrator.
Table 17: TOE Access Methods
Applications Interface
SSHv2* ‐ Client (e.g. PuTTy, BSD ssh)
OpenSSH 5.5p1 ‐ Server
Ethernet administrative network interface
RS232 Console via serial cable Serial interface
* Any compliant application capable of running this protocol or service.
7.8 Trusted Path/Channels
The two sections below contain the communication mechanisms and protocols used for each authorized
IT entity supported by the TOE.
7.8.1 IT Entity ‐ Audit Server
Table 18: Audit Protocols and Communication Mechanisms
Applications Allowed Communication Protocols Communication Mechanism
EOS rsyslog ‐ Client
Syslog* ‐ Server
Layer 7 ‐ syslog ‐ RFC 5424
Layer 5\6 ‐ Plaintext socket
Layer 4 ‐ TCP
Layer 3‐ IP
TCP port forwarding over SSHv2
* Any compliant application capable of running this protocol or service.
7.8.2 Remote TOE Administration Methods
When a user connects to the TOE via SSHv2 they are initiating an instance of the CLI which provides
administration of the TOE. All CLI traffic is transmitted over the SSHv2 connection detailed below.
Table 19: Remote TOE Administration Methods
Applications Communication Protections
SSHv2* ‐ Client
OpenSSH 5.5p1 ‐ Server
Authentication ‐ RSA 2048 asymmetric key pair
Encryption ‐ AES 128\256 CBC (diffie‐hellman‐group14‐sha1 for key exchange)
Data Integrity ‐ HMAC‐SHA1
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8 Terms and Definitions
Table 20: TOE Abbreviations and Acronyms
Abbreviations/
Acronyms
Description
AAA Authentication Authorization and Accounting
ACL Access Control List
CLI Command Line Interface
CPU Central Processing Unit
CSP Critical Security Parameter
ECN Electronic Communication Networks
HPC High Performance Computing
KAT Known Answer Tests
NAT Network Address Translation
OSI Open Systems Interconnection
PAM Pluggable Authentication Modules
PCT Pairwise Consistency Test
PC Personal Computer
QoS Quality of Service
QSFP Quad Small Form‐factor Pluggable
SFP Small Form‐factor Pluggable
SSH Secure Shell
STP Spanning Tree Protocol
VLAN Virtual Local Area Network
Table 21: CC Abbreviations and Acronyms
Abbreviations/
Acronyms
Description
CAC Common Access Card
CAP Composed Assurance Package
CC Common Criteria
CCRA Arrangement on the Recognition of Common Criteria Certificates in the field of IT Security
DAC Discretionary Access Control
DOD Department of Defense
EAL Evaluation Assurance Level
IT Information Technology
OSP Organizational Security Policy
PP Protection Profile
SAR Security Assurance Requirement
SFR Security Functional Requirement
SFP Security Function Policy
ST Security Target
TOE Target of Evaluation
TSF TOE Security Functionality
TSFI TSF Interface
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9 References
Table 22: TOE Guidance Documentation
Reference Description Version Date
[1] Common Criteria Guidance Supplement Arista 7150, 7050X, 7250X,
7300X and 7500E Series Switches Guidance Document AGD_OPE.1,
AGD_PRE.1
1.4 June 10, 2014
[2] Arista User Manual N/A June 9, 2014
[3] Arista EOS System Message Guide N/A April 18, 2014
[4] Arista 7000 Series 2 RU Data Center Switches Quick Start Guide N/A N/A
[5] Arista 7300 Series Modular Data Center Switches Quick Start
Guide
N?A N/A
[6] Arista 7500 Series Modular Data Center Switches Quick Start
Guide
N/A N/A
Table 23: Common Criteria v3.1 References
Reference Description Version Date
[7] Common Criteria for Information Technology Security Evaluation
Part 1: Introduction and general model CCMB‐2009‐07‐001
V3.1 R3 July 2009
[8] Common Criteria for Information Technology Security Evaluation
Part 2: Security functional components CCMB‐2009‐07‐002
V3.1 R3 July 2009
[9] Common Criteria for Information Technology Security Evaluation
Part 3: Security assurance components CCMB‐2009‐07‐003
V3.1 R3 July 2009
[10] Common Criteria for Information Technology Security Evaluation
Evaluation Methodology CCMB‐2009‐07‐004
V3.1 R3 July 2009
Table 24: Supporting Documentation
Reference Description Version Date
[11] Network Device Protection Profile 1.1 June 8, 2012
[12] Security Requirements for Network Devices Errata #1 1.0 December 19, 2013
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10 Annex A: OpenSSH Documented Deviations and Extensions
This documents OpenSSH's deviations and extensions to the published SSH
protocol.
Note that OpenSSH's sftp and sftp-server implement revision 3 of the SSH
filexfer protocol described in:
http://www.openssh.com/txt/draft-ietf-secsh-filexfer-02.txt
Newer versions of the draft will not be supported, though some features
are individually implemented as extensions described below.
The protocol used by OpenSSH's ssh-agent is described in the file
PROTOCOL.agent
1. Transport protocol changes
1.1. transport: Protocol 2 MAC algorithm "umac-64@openssh.com"
This is a new transport-layer MAC method using the UMAC algorithm
(rfc4418). This method is identical to the "umac-64" method documented
in:
http://www.openssh.com/txt/draft-miller-secsh-umac-01.txt
1.2. transport: Protocol 2 compression algorithm "zlib@openssh.com"
This transport-layer compression method uses the zlib compression
algorithm (identical to the "zlib" method in rfc4253), but delays the
start of compression until after authentication has completed. This
avoids exposing compression code to attacks from unauthenticated users.
The method is documented in:
http://www.openssh.com/txt/draft-miller-secsh-compression-delayed-00.txt
1.3. transport: New public key algorithms "ssh-rsa-cert-v00@openssh.com",
"ssh-dsa-cert-v00@openssh.com",
"ecdsa-sha2-nistp256-cert-v01@openssh.com",
"ecdsa-sha2-nistp384-cert-v01@openssh.com" and
"ecdsa-sha2-nistp521-cert-v01@openssh.com"
OpenSSH introduces new public key algorithms to support certificate
authentication for users and hostkeys. These methods are documented in
the file PROTOCOL.certkeys
1.4. transport: Elliptic Curve cryptography
OpenSSH supports ECC key exchange and public key authentication as
specified in RFC5656. Only the ecdsa-sha2-nistp256, ecdsa-sha2-nistp384
and ecdsa-sha2-nistp521 curves over GF(p) are supported. Elliptic
curve points encoded using point compression are NOT accepted or
generated.
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1.5 transport: Protocol 2 Encrypt-then-MAC MAC algorithms
OpenSSH supports MAC algorithms, whose names contain "-etm", that
perform the calculations in a different order to that defined in RFC
4253. These variants use the so-called "encrypt then MAC" ordering,
calculating the MAC over the packet ciphertext rather than the
plaintext. This ordering closes a security flaw in the SSH transport
protocol, where decryption of unauthenticated ciphertext provided a
"decryption oracle" that could, in conjunction with cipher flaws, reveal
session plaintext.
Specifically, the "-etm" MAC algorithms modify the transport protocol
to calculate the MAC over the packet ciphertext and to send the packet
length unencrypted. This is necessary for the transport to obtain the
length of the packet and location of the MAC tag so that it may be
verified without decrypting unauthenticated data.
As such, the MAC covers:
mac = MAC(key, sequence_number || packet_length || encrypted_packet)
where "packet_length" is encoded as a uint32 and "encrypted_packet"
contains:
byte padding_length
byte[n1] payload; n1 = packet_length - padding_length - 1
byte[n2] random padding; n2 = padding_length
1.6 transport: AES-GCM
OpenSSH supports the AES-GCM algorithm as specified in RFC 5647.
Because of problems with the specification of the key exchange
the behaviour of OpenSSH differs from the RFC as follows:
AES-GCM is only negotiated as the cipher algorithms
"aes128-gcm@openssh.com" or "aes256-gcm@openssh.com" and never as
an MAC algorithm. Additionally, if AES-GCM is selected as the cipher
the exchanged MAC algorithms are ignored and there doesn't have to be
a matching MAC.
2. Connection protocol changes
2.1. connection: Channel write close extension "eow@openssh.com"
The SSH connection protocol (rfc4254) provides the SSH_MSG_CHANNEL_EOF
message to allow an endpoint to signal its peer that it will send no
more data over a channel. Unfortunately, there is no symmetric way for
an endpoint to request that its peer should cease sending data to it
while still keeping the channel open for the endpoint to send data to
the peer.
This is desirable, since it saves the transmission of data that would
otherwise need to be discarded and it allows an endpoint to signal local
processes of the condition, e.g. by closing the corresponding file
descriptor.
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OpenSSH implements a channel extension message to perform this
signalling: "eow@openssh.com" (End Of Write). This message is sent by
an endpoint when the local output of a session channel is closed or
experiences a write error. The message is formatted as follows:
byte SSH_MSG_CHANNEL_REQUEST
uint32 recipient channel
string "eow@openssh.com"
boolean FALSE
On receiving this message, the peer SHOULD cease sending data of
the channel and MAY signal the process from which the channel data
originates (e.g. by closing its read file descriptor).
As with the symmetric SSH_MSG_CHANNEL_EOF message, the channel does
remain open after a "eow@openssh.com" has been sent and more data may
still be sent in the other direction. This message does not consume
window space and may be sent even if no window space is available.
NB. due to certain broken SSH implementations aborting upon receipt
of this message (in contravention of RFC4254 section 5.4), this
message is only sent to OpenSSH peers (identified by banner).
Other SSH implementations may be whitelisted to receive this message
upon request.
2.2. connection: disallow additional sessions extension
"no-more-sessions@openssh.com"
Most SSH connections will only ever request a single session, but a
attacker may abuse a running ssh client to surreptitiously open
additional sessions under their control. OpenSSH provides a global
request "no-more-sessions@openssh.com" to mitigate this attack.
When an OpenSSH client expects that it will never open another session
(i.e. it has been started with connection multiplexing disabled), it
will send the following global request:
byte SSH_MSG_GLOBAL_REQUEST
string "no-more-sessions@openssh.com"
char want-reply
On receipt of such a message, an OpenSSH server will refuse to open
future channels of type "session" and instead immediately abort the
connection.
Note that this is not a general defence against compromised clients
(that is impossible), but it thwarts a simple attack.
NB. due to certain broken SSH implementations aborting upon receipt
of this message, the no-more-sessions request is only sent to OpenSSH
servers (identified by banner). Other SSH implementations may be
whitelisted to receive this message upon request.
2.3. connection: Tunnel forward extension "tun@openssh.com"
OpenSSH supports layer 2 and layer 3 tunnelling via the "tun@openssh.com"
channel type. This channel type supports forwarding of network packets
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with datagram boundaries intact between endpoints equipped with
interfaces like the BSD tun(4) device. Tunnel forwarding channels are
requested by the client with the following packet:
byte SSH_MSG_CHANNEL_OPEN
string "tun@openssh.com"
uint32 sender channel
uint32 initial window size
uint32 maximum packet size
uint32 tunnel mode
uint32 remote unit number
The "tunnel mode" parameter specifies whether the tunnel should forward
layer 2 frames or layer 3 packets. It may take one of the following values:
SSH_TUNMODE_POINTOPOINT 1 /* layer 3 packets */
SSH_TUNMODE_ETHERNET 2 /* layer 2 frames */
The "tunnel unit number" specifies the remote interface number, or may
be 0x7fffffff to allow the server to automatically chose an interface. A
server that is not willing to open a client-specified unit should refuse
the request with a SSH_MSG_CHANNEL_OPEN_FAILURE error. On successful
open, the server should reply with SSH_MSG_CHANNEL_OPEN_SUCCESS.
Once established the client and server may exchange packet or frames
over the tunnel channel by encapsulating them in SSH protocol strings
and sending them as channel data. This ensures that packet boundaries
are kept intact. Specifically, packets are transmitted using normal
SSH_MSG_CHANNEL_DATA packets:
byte SSH_MSG_CHANNEL_DATA
uint32 recipient channel
string data
The contents of the "data" field for layer 3 packets is:
uint32 packet length
uint32 address family
byte[packet length - 4] packet data
The "address family" field identifies the type of packet in the message.
It may be one of:
SSH_TUN_AF_INET 2 /* IPv4 */
SSH_TUN_AF_INET6 24 /* IPv6 */
The "packet data" field consists of the IPv4/IPv6 datagram itself
without any link layer header.
The contents of the "data" field for layer 2 packets is:
uint32 packet length
byte[packet length] frame
The "frame" field contains an IEEE 802.3 Ethernet frame, including
header.
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3. SFTP protocol changes
3.1. sftp: Reversal of arguments to SSH_FXP_SYMLINK
When OpenSSH's sftp-server was implemented, the order of the arguments
to the SSH_FXP_SYMLINK method was inadvertently reversed. Unfortunately,
the reversal was not noticed until the server was widely deployed. Since
fixing this to follow the specification would cause incompatibility, the
current order was retained. For correct operation, clients should send
SSH_FXP_SYMLINK as follows:
uint32 id
string targetpath
string linkpath
3.2. sftp: Server extension announcement in SSH_FXP_VERSION
OpenSSH's sftp-server lists the extensions it supports using the
standard extension announcement mechanism in the SSH_FXP_VERSION server
hello packet:
uint32 3 /* protocol version */
string ext1-name
string ext1-version
string ext2-name
string ext2-version
...
string extN-name
string extN-version
Each extension reports its integer version number as an ASCII encoded
string, e.g. "1". The version will be incremented if the extension is
ever changed in an incompatible way. The server MAY advertise the same
extension with multiple versions (though this is unlikely). Clients MUST
check the version number before attempting to use the extension.
3.3. sftp: Extension request "posix-rename@openssh.com"
This operation provides a rename operation with POSIX semantics, which
are different to those provided by the standard SSH_FXP_RENAME in
draft-ietf-secsh-filexfer-02.txt. This request is implemented as a
SSH_FXP_EXTENDED request with the following format:
uint32 id
string "posix-rename@openssh.com"
string oldpath
string newpath
On receiving this request the server will perform the POSIX operation
rename(oldpath, newpath) and will respond with a SSH_FXP_STATUS message.
This extension is advertised in the SSH_FXP_VERSION hello with version
"1".
3.4. sftp: Extension requests "statvfs@openssh.com" and
"fstatvfs@openssh.com"
These requests correspond to the statvfs and fstatvfs POSIX system
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interfaces. The "statvfs@openssh.com" request operates on an explicit
pathname, and is formatted as follows:
uint32 id
string "statvfs@openssh.com"
string path
The "fstatvfs@openssh.com" operates on an open file handle:
uint32 id
string "fstatvfs@openssh.com"
string handle
These requests return a SSH_FXP_STATUS reply on failure. On success they
return the following SSH_FXP_EXTENDED_REPLY reply:
uint32 id
uint64 f_bsize /* file system block size */
uint64 f_frsize /* fundamental fs block size */
uint64 f_blocks /* number of blocks (unit f_frsize) */
uint64 f_bfree /* free blocks in file system */
uint64 f_bavail /* free blocks for non-root */
uint64 f_files /* total file inodes */
uint64 f_ffree /* free file inodes */
uint64 f_favail /* free file inodes for to non-root */
uint64 f_fsid /* file system id */
uint64 f_flag /* bit mask of f_flag values */
uint64 f_namemax /* maximum filename length */
The values of the f_flag bitmask are as follows:
#define SSH_FXE_STATVFS_ST_RDONLY 0x1 /* read-only */
#define SSH_FXE_STATVFS_ST_NOSUID 0x2 /* no setuid */
Both the "statvfs@openssh.com" and "fstatvfs@openssh.com" extensions are
advertised in the SSH_FXP_VERSION hello with version "2".
10. sftp: Extension request "hardlink@openssh.com"
This request is for creating a hard link to a regular file. This
request is implemented as a SSH_FXP_EXTENDED request with the
following format:
uint32 id
string "hardlink@openssh.com"
string oldpath
string newpath
On receiving this request the server will perform the operation
link(oldpath, newpath) and will respond with a SSH_FXP_STATUS message.
This extension is advertised in the SSH_FXP_VERSION hello with version
"1".
$OpenBSD: PROTOCOL,v 1.20 2013/01/08 18:49:04 markus Exp $